FOR MODEL LF 1000, MODEL LF 2000, MODEL LF 3000 .
FOR MODEL LF 1000, MODEL LF 2000, MODEL LF 3000INSTALLATION AND OPERATION MANUALINTRODUCTIONHOW THE LF SERIES TABLET FEEDERS WORKBio-Dynamic LF Series tablet feeders are complete dryBio-Dynamic LF Series tablet feeders are flow ratedchemical dosing systems for water, wastewater, stormwaterproportional chemical dosing units. Flow to be treated entersand process water treatment. They are designed to providethe tablet feeders through the 4" integral inlet hub. The liquidautomatic control over the chemical application rate andthen proceeds to the flow deck where the chemical tabletsmaximize installation flexibility. The LF Series tablet feedersare contained in one to three chemical feed tubes. Theconsists of five separate models to accommodate flowsnumber of chemical feed tubes varies by model. The flowranging from less than 100 GPD through 400,000 GPDdeck has three levels (tiers) which accommodate varyingand chemical dosage ranginghydraulic loads and properly from 1 to 50 mg/L, dependingchannels liquid to the chemicalBIO-DYNAMIC DRY CHEMICAL FEEDERupon the general componenttablets. Active chemicals areconfiguration, daily flow ratereleased into the flow streamand the type of chemicalas the liquid erodes the tablets.tablets applied. All models ofWhen the incoming flow rateLF Series tablet feeders areincreases, the liquid level inmanufactured from durable ABSthe tablet feeder rises. Theand can be glued to Scheduleincrease in liquid level causes40 PVC piping. When properlythe flow to contact more tablets,installed, the Bio-Dynamicthereby providing the additionaltablet feeders will provide longchemical release required forterm, unattended operation andconsistent treatment. As theprecise chemical applicationflow decreases, it contacts fewerthroughout their rated flowtablets, reducing the chemicalranges. Please familiarizedosage. After contact withyourself with the contents of thisthe chemical tablets, properlymanual before proceeding withtreated liquid exits the tabletinstallation and operation.feeder through the 4" outlet hub.SYSTEM APPLICATIONSYSTEM PERFORMANCEBio-Dynamic LF Series tabletBio-Dynamic LF Series tabletfeeders are designed to feedfeeders are listed as a chlorine2 5/8" chemical tablets in gravitydisinfection device for secondaryflow applications. These tableteffluent from residentialfeeders are not to be used forwastewater treatment systemspressurized applications andunder NSF/ANSI Standard 46must have a gravity outflow.and 385. Certification requiresTABLET FEEDER MODEL LF 1000Common applications for thethe use of Norweco Blue CrystalLF Series tablet feeders areor Bio-Sanitizer disinfectingtreating flows from septic tanks; aerobic treatment units;tablets and a chlorine contact tank of at least 120 gallons.sand filters; rock reed filters; curtain drains; constructedContact tank retention time must comply with the controllingwetlands; marine sanitation devices (MSD); individual,regulatory jurisdiction. USEPA guidelines state “On thecommunity and municipal drinking water systems; processaverage, satisfactory disinfection of secondary wastewaterwater systems; reservoirs; water towers; cooling towerseffluent can be obtained when the chlorine residual is 0.5 ppmand irrigation systems. All LF Series tablet feeders canafter 15 minutes contact.” Significantly greater contact time canbe installed at grade, in-line or below grade.decrease disinfection efficiency and allow bacteria regrowth.
GENERAL INSTALLATION INSTRUCTIONSDIRECT BURIAL INSTALLATIONBio-Dynamic LF Series tablet feeders can be installedinto any gravity flow water supply or wastewater treatmentsystem. When used for potable water disinfection, thefeeder is typically installed at grade following final filtrationand just prior to a storage or detention tank. For wastewaterdisinfection applications, the tablet feeder is installedfollowing clarification and prior to or in a chlorine contacttank. Installation can be at grade or direct buried. Fordechlorination, feeders can be installed in or immediatelyfollowing the chlorine contact tank. When chlorinating anddechlorinating effluent, two separate Bio-Dynamic tabletfeeders must be installed. Do not mix chlorination anddechlorination tablets within the same tablet feeder.All models of LF Series tablet feeders may be installed belowgrade without a manhole or secondary enclosure. Preparean excavation to the proper depth (See Figure B), includinga sand or fine gravel leveling pad at least 4" thick. Thetablet feeder must be supported by this pad before inlet andoutlet piping is attached to the feeder. Excavated trenchesshould be smooth and free of debris to prevent damageto the pipe. Connecting lines should be laid continuouslyand unspliced to undisturbed earth beyond the limits of theexcavation (See Figure C). Schedule 40 PVC, cast iron orsimilar materials may be used, subject to the approval oflocal codes. Attach the inlet and outlet lines to the inlet andoutlet hubs using ABS compatible glue. A 4" Schedule 40PVC pipe with tamper-proof cap (not supplied) will be usedas a riser to grade. Connect the pipe to the riser hub usingABS compatible glue. Do not cement the cap. Check thesystem for plumb and level from side to side, end to endand vertically along the riser pipe. Backfill the excavation.Fine, loose fill should be used to backfill the excavation andplumbing line trenches. Exercise care when backfilling.Finished grade should be at least 6" below the top of the riserpipe and should slope away for surface drainage. Recheckthat the feeder is plumb and level.FIGURE AFIGURE BCHAMBER MOUNTING BRACKETSIntegrally molded inlet and outlet hubs allow directconnection of the tablet feeder to Schedule 40 PVC piping.Adapter couplings should be used, if necessary, to modifypiping diameters and insure a secure piping connection tothe tablet feeder. The effluent line must allow for a 1/8" fallper linear foot of run along the entire piping run. All tabletfeeders must be installed plumb and level to insure properoperation. Place a bubble level on the feeder before finalinstallation to confirm the unit is plumb and level, side toside and end to end. Always recheck level after installation.INSTALLATION AT GRADELF Series tablet feeders can be installed at grade, in-lineor mounted in the contact tank of a water or wastewatertreatment system. The installation should be accessiblefor routine operator maintenance. To mount the unit, use⁵ 16" diameter corrosion resistant bolts to secure the fourintegrally molded mounting feet to the deck of the contacttank, concrete pad or mounting brackets, as required. Forcontact tank installations, use PVC or aluminum mountingbrackets to prevent corrosion (See Figure A).DIRECT BURIAL AND REMOTE DIRECT BURIALEXISTING SYSTEM RETROFITIf the existing treatment system piping is in good condition,the feeder can be fitted directly into the appropriate location.When installing a tablet feeder into an existing disinfectionsystem, it is recommended that the chlorine contact tankbe pumped and thoroughly cleaned with a diluted bleachsolution prior to installation of the feeder. Failure to properlyclean the contact tank may result in inadequate disinfectionof the wastewater. It is also necessary to inspect allupstream and downstream treatment components toconfirm that they are installed and functioning properly.
TIERED FLOW DECKREMOTE REMOVAL SYSTEMA multi-tiered flow deck is incorporated in all LF Seriestablet feeders. This allows consistent chemical applicationto low, sustained, variable, intermittent and surge flows.Liquid is channeled through the three tiers of the flow deckin proportion to the hydraulic load (See Figure D). Thelowest tier of the flow deck is the inert drainage tier. The inertdrainage tier directs liquid to the feed tube during low flowconditions and forms a drainage channel to dry the tabletswhen there is no flow. As the flow increases, the liquid ischanneled through the intermediate flow tier. This tier directsthe increased flow to the chemical tablets and allows moretablets to contact the liquid. At higher flow rates, the liquidrises to the upper flow tier. The upper tier dissipates excessflow velocity and produces a consistent chemical dosage.The flow deck incorporates a retaining ring with locating ribsfor the feed tubes. The locating ribs engage positioning slotsin the feed tube to secure the tube in the proper installationposition for the feeder’s rated capacity.A remote removal system is available for direct burialinstallations to allow for safe removal, recharge andreinstallation of the feed tube from grade. The remoteremoval system consists of a top-threaded feed tubecap, one extension and one handle. For use, replace thestandard cap with the top-threaded cap. The top-threadedcap locks into the feed tube, then the extension and handleare threaded onto the top of the new cap (See Figure E).Additional extensions are available for deeper installationsand can be added or removed any time. The extension(s)and handle remain in place during system operation andstandard feed tube filling instructions apply.FIGURE DFIGURE CTHREE TIERED FLOW DECKFILLING AND INSTALLING THE FEED TUBECONTINUOUS AND UNSPLICEDCLEARCHECK FEED TUBE AND CAPThe LF Series tablet feeders are equipped with molded,chemical feed tubes with twist lock caps. Each feed tube andcap are constructed of NSF/ANSI Standard 61 listed PVCfor durability and long life. The feed tube is manufacturedwith the translucent ClearCheck design. This design allowsthe operator or service provider to determine whethertablet refill is required simply by visual inspection withoutremoving the tube from the feeder. The feed tube utilizeschemical tablets with the nominal weight and dimensionsof 5 ounces, 2 ⁵ 8" diameter and ¹³ 16" to 1" height. Slotsmolded directly into the bottom of the feed tube allow thechemical tablets to dry during intermittent or prolonged noflow periods. The twist lock cap fits securely inside thechemical feed tube to allow convenient installation of thetube and cap within a 4" Schedule 40 PVC riser pipe.Before handling any chemical tablets, carefully read theproduct container label and the CAUTION section of theseinstructions. When filling the feed tube, always wear rubbergloves and safety goggles or a face shield for properprotection. Follow all handling instructions for the chemicaltablets used. To fill the feed tube, remove it from the feeder.Rinse the feed tube and cap thoroughly with fresh water.Dry as required. Hold the tube, slotted end up, at a 30 to45 angle and slide the chemical tablets into the open feedtube, one tablet at a time. Insure that each tablet lies flat,against the next and evenly on top of one another, in thefeed tube (See Figure F). Use a gloved hand to retain thetablets inside the open end of the inverted tube until it hasbeen evenly and completely filled. Carefully return the tubeto the upright position. Replace the cap and slide the feedtube into the body of the feeder, slotted end down. The slotsin the bottom of the feed tube must properly engage thelocating ribs molded into the flow deck. Be sure the feedtube is fully engaged within the feeder and rests evenly onthe flow deck. Utilize the Chemical Consumption Record onthe back of this manual to track the chemical refill pattern.
BIO-SANITIZER DISINFECTING TABLETSBIO-MAX DECHLORINATION TABLETSIf the tablet feeder is to be used for the disinfection of wateror wastewater, a 10 lb., 25 lb., 45 lb. or 100 lb. supply ofBio-Sanitizer disinfecting tablets is available from yourlocal distributor. Bio-Sanitizer tablets insure dependabledisinfection for water and wastewater treatment system flowand other applications where a predictable long-term sourceof chlorine is desirable. The tablets are manufactured frompure calcium hypochlorite and contain at least 70% availablechlorine. Bio-Sanitizer disinfecting tablets are registeredwith the USEPA for water and wastewater treatment. Thetablets incorporate beveled edges to enhance the chemicaldissolution pattern, providing effective and economicalbacteria killing power. Each tablet is 2 ⁵ 8" diameter,compressed to a ¹³ 16" thickness, has an approximate weightof 5 ounces and is white in color for easy identification. Thechemical application rate of Bio-Sanitizer tablets remainsconsistent at peak flow factors as high as four.If the tablet feeder is to be used for the dechlorinationof water or wastewater a 48 lb. supply of Bio-Maxdechlorination tablets is available from your localdistributor. Containing 92% sodium sulfite, the tablets aremanufactured to neutralize both free and combined chlorine.Bio-Max tablets incorporate beveled edges to enhance thechemical dissolution pattern. Each tablet is 2 ⁵ 8" diameter,compressed to a ¹³ 16" thickness, weighs approximately 5ounces and is green in color for easy identification. Thetablets dissolve slowly, releasing controlled amounts ofchemical for the instantaneous removal of residual chlorinefrom the water or wastewater flow. The chemical applicationrate of the tablets remains consistent at peak flow factorsas high as four. Bio-Max tablets are formulated to removechlorine residuals to non-detectable levels.FIGURE FFIGURE ETABLETS MUST LIE FLAT IN THE STACKREMOTE REMOVAL HANDLES AND CAPBLUE CRYSTAL DISINFECTING TABLETSIf the tablet feeder is to be used for the disinfection ofresidential wastewater, a 1.9 lb., 10 lb. or 100 lb. supplyof Blue Crystal residential disinfecting tablets is availablefrom your local distributor. Blue Crystal tablets are the firstdisinfectant that has been specifically developed for use inresidential wastewater treatment applications. Formulatedto maintain positive disinfection during the low, sustained,variable and intermittent flow rates that are common toresidential wastewater treatment systems, Blue Crystaltablets are produced with a proprietary beveled edge designto enhance the chemical dissolution pattern. Each tabletis 2 ⁵ 8" diameter, compressed to a 1" thickness, has anapproximate weight of 5 ounces and is white in color withblue crystals for easy identification. Containing a minimumof 70% available chlorine, Blue Crystal tablets are registeredwith the USEPA for water and wastewater treatment.BIO-PERC REMEDIATION TABLETSIf the tablet feeder is to be used for the bioaugmentationof wastewater, a 10 lb. supply of Bio-Perc biologicalremediation tablets is available from your local distributor.Bio-Perc tablets rejuvenate failing wastewater treatmentsystems by reducing or eliminating organic buildup indistribution lines and disposal processes. Bio-Perc tabletshelp sand filters and soil-based treatment systems recovertheir infiltrative capacity while preventing the failure of newinstallations. Each tablet is 2 ⁵ 8" diameter, compressedto a 1" thickness, has an approximate weight of 5 ouncesand incorporates a beveled edge design to reduce wicking.CAUTION: All chemicals and chemical feed systemsshould be handled with care. Chemicals and feedtubes should not be mixed with each other or any otherproducts. Do not handle tablets or feed tubes withoutfirst carefully reading the product container label, SDSinformation and the handling and storage instructions.
PLACING THE BIO-DYNAMIC ON-LINEBe sure the entire liquid stream from the facility being served flows through the tablet feeder. Confirm that the proper chemicaltablets are being used in the feed tube and that the feed tube is firmly engaged into the retaining ring and locating ribs of the flowdeck. After the system has been in operation for at least one hour, draw a sample of the treated effluent from the feeder outletor the contact chamber inlet to test the chemical application. For chlorination applications, testing can be done using a chlorinetest kit, available from your Bio-Dynamic distributor, or a DPD Colorimetric test as outlined in the most recent edition of StandardMethods for the Examination of Water and Wastewater. Dechlorination applications may also require that a chlorine residual testbe performed. Multiple samples must be taken to insure that the system has reached equilibrium. Take samples at 15 minuteintervals. When three or more consecutive samples produce the same results, the system has reached equilibrium. In directburial installations, make sure the riser pipe extends at least 6" above grade and is covered securely by a tamper-proof pipe cap.OPERATIONAL ADJUSTMENTLF Series feeders can be adjusted without taking the unit off-line. When fully inserted into the feeder body, the feed tube locksinto locating ribs molded into the flow deck. This locked position provides the maximum chemical dose. Rotating the feedtube clockwise, one-quarter (1/4) turn from its fully locked position raises the feed tube approximately one-eighth inch (1/8"). Byraising the feed tube, the chemical delivery can be reduced. Please refer to the Operational Adjustment Chart at the bottom ofthis page for routine guidance. If there are additional questions regarding operation, contact your local Bio-Dynamic distributor.For further reference, a red identification tag with the contact information of the manufacturer is attached to the feeder.ROUTINE MAINTENANCELF Series feeders require very little maintenance other than refilling of the feed tubes as needed and bi-annually cleaning.When performing maintenance, always wear rubber gloves and safety goggles or a face shield and follow the proceduresoutlined in the handling instructions for the chemicals used in the feeder. Before refilling the feed tubes, rinse the tube and capthoroughly with fresh water. Occasionally, a feed tube may need to be cleaned with a brush. A service brush for cleaning thefeed tube and flow deck is available from your local Bio-Dynamic distributor. To use the brush, remove the extension handlefrom the top-threaded feed tube cap and screw the brush into the handle. When refilling the feed tube, check the inside of thefeeder and rinse any residue with a low pressure hose. Dry the feed tube with a clean cloth before reinserting chemical tablets.The liquid flow will normally prevent accumulation of debris during routine operation. Debris that may become lodged withinthe feeder during a malfunction of the upstream treatment system can be removed with the cleaning brush or a gloved hand.INTERMITTENT USAGEDuring a period of intermittent use or extended period of non-use, feed tubes should be removed and stored in a well-ventilated,dry, secure location. Refer to the tablet container label and material safety data sheet for detailed safety, storage and/or disposalinstructions for the chemical tablets. Reinstall the riser cap securely for the time period the system will be unattended.OPERATIONAL ADJUSTMENT pplicationof ChemicalPossible CauseRecommended RemedyFeed tube emptyRefill chemical tabletsIncorrect type of tablets usedReplace using properly approved tabletsFeed tube not properly installedInstall the feed tube flat on flow deckTablets jammed in the feed tubeRemove, clean and properly refill the feed tubeExcess solids in effluentTroubleshoot treatment plantDebris clogging bottom of the feed tubeRemove, clean and properly refill the feed tubeTablet feeder not levelAdjust mounting positionTablets more than one year oldRemove, clean and properly refill the feed tubeIncorrect type of tablets usedReplace using properly approved tabletsBlockage at outletRinse feeder wit fresh water to remove blockageToo many tablets immersedRotate the feed tube clockwise 90 degreesExcess hydraulic flowEqualize flow prior to the tablet feederRecirculation piping not properly adjustedIncrease percentage of recirculation flowTablet feeder not levelAdjust mounting position
SYSTEM SAFETYAll installations not protected by a safety fence or lockedgrating should be equipped with a Schedule 40 PVC riserpipe with tamper-proof pipe cap. Only authorized personnelshould have access to the tablet feeder and its components.Confined space entry equipment (Occupational Safety andHealth Regulations OSHA 29, CFR1910.146) is not requiredfor a properly installed Bio-Dynamic LF Series tablet feederin a direct burial installation. Maintenance of the tabletfeeder can be performed from grade. Rubber gloves andsafety goggles or a face shield should always be worn whenproviding service to any chemical feed system. Toxic fumespresent in wastewater and/or tablets may accumulate withinthe feeder and cause personal injury or death. All safety andhandling procedures for chemical tablets must be followedcompletely. Water and wastewater treatment chemicals canbe very dangerous. Thoroughly read chemical containerlabel before use. Only trained personnel using the propersafety procedures and approved equipment should beallowed in the vicinity of a treatment system.BIO-DYNAMIC LIMITED WARRANTYThe Bio-Dynamic Model LF Series tablet feeders arebacked by a comprehensive ten year limited warranty.The purchaser is protected from defects in materialand workmanship, under normal use and service, for aperiod of ten years from the date of original purchase.The Bio-Dynamic distributor will provide a warrantyregistration card, as well as detailed warranty andexchange information, to each purchaser. This warrantyis not effective unless the warranty registration cardis returned to the factory within 30 days of purchase.If the tablet feeder or components require service orreplacement, do not use or dismantle the unit. Contactyour local, authorized Bio-Dynamic distributor to arrangefor inspection, service or replacement of the system orcomponent. After inspection, the distributor will returnthe tablet feeder or component, as required, to thefactory and replace the necessary items according tothe terms of the limited warranty.CHEMICAL CONSUMPTION RECORDFor your reference, please document chemical consumption and maintenance on the following chart:DISTRIBUTED LOCALLY BY:220 REPUBLIC STREETNORWALK, OHIO, U.S.A. 44857TELEPHONE (419) 668-4471FAX (419) 663-5440www.norweco.comNorweco , Norweco.com , Singulair , Modulair , Travalair , Singulair R3 , Singulair Green , Ribbit Rivet , Hydro-Kinetic , Hydro-Kinetic Bio-FilmReactor ,Evenair , Lift-Rail , Microsonic , Bio-Dynamic , Bio-Sanitizer , Bio-Neutralizer , Bio-Kinetic , Bio-Static , Bio-Gem , Bio-Max , Bio-Perc ,Blue Crystal , Phos-4-Fade , Enviro-C , Nitro-Buster , ClearCheck , ChemCheck , Tri-Max , Hydra-Max , Service Pro , MCD , TNT , WASP ,Grease Buster and “BUSTER” logo are registered trademarks of Norwalk Wastewater Equipment Company, Inc. MMXX NORWECO, INC. / REV. 11/2020
conditions and forms a drainage channel to dry the tablets when there is no flow. As the flow increases, the liquid is channeled through the intermediate flow tier. This tier directs the increased flow to the chemical tablets and allows more tablets to contact the liquid.
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