Norweco Bio-Dynamic® LF Series Tablet Feeders
The Bio-Dynamic LF series of tablet feeders by Norweco are in-line chlorine tablet dispensers for disinfection in water supply systems.
The Bio-Dynamic LF series of tablet feeders by Norweco are chlorine tablet dispensers designed to be connected to a water supply system. The LF Series tablet feeders have no moving or electrical parts and are typically used for small on-site systems or remote water supply systems. There are four models available: the LF 1000, LF 2000, LF 3000, and LF 4000 for flows of 300 liters/day to 1.5 million liters/day (<100 gallons per day to 400,000 gallons per day). Chlorine tablets are added to the feeder, slowly dispensing dosages ranging from 1 mg/L to 50 mg/L, depending on the model size and water flow rate. The Bio-Dynamic LF series of tablet feeders accept dry chemical tablets that are 66.7 mm (2 5/8″) in diameter.
Norweco and authorized distributors of Bio-Dynamic Products
90 – 455 USD, depending on the model
Other small community-scale disinfection techniques and automated chlorine dispensers, including Wata-Standard, Lotus Water, and Zimba.
Goal 6: Clean water and sanitation
Water utilities, small community water managers
Bio-Dynamic is mass produced from PVC and injection-molded plastics.
TrademarkedInterview with representative
Users can obtain the product directly from Norweco’s online catalog or by ordering from authorized distributors worldwide.
2,800 to 3,500 tablet feeders are sold each year.Interview with representative
Active chemical and concentration (%) of the product (not the concentration of the treated water)
Form of the chemical disinfection
Does the water flow through a treatment system or does it remain in a container?
Is the dose of the chemical administered automatically or manually?
Manufacturer-specified dosing quantity
Manufacturer-specified time until water is potable, measured in minutes
Remaining level of chemical concentration after manufacturer-specified contact time
Laboratory-evaluated log scale removal rate of bacteria
Laboratory-evaluated log scale removal rate of viruses
Laboratory-evaluated log scale removal rate of protozoa
Reduction levels of heavy metals and/or arsenic through this treatment system
How long can the treated water remain protected and safe to drink?
Manufacturer-specified maximum level of inlet turbidity (NTU)
Designed for gravity-fed water that has been filtered. The feeder is installed prior to a storage tank. The water to be treated enters in the 4″ PVC inlet and exits through a 4″ PVC outlet. The water erodes the tablets as it passes through. The LF Series have 1, 2, 3, or 4 feeder tubes for holding chlorine tablets. The LF 1000 holds 20 tablets, LF 2000 holds 40 tablets, LF 3000 holds 60 tablets, and LF 4000 holds 80 tablets. Typically a bypass arrangement is used so 10-30% of the total flow passes through the tablet feeder to prevent over-chlorination.
Any dry chemical tablet with dimensions 66.7 mm (2 5/8″) in diameter and height of 25.4 mm (1″) may be used in the tablet feeders. Norweco’s chlorine tablet product is the Bio-Sanitizer®, which contains 70% available chlorine and sold in 10 lb., 25 lb., 45 lb. and 100 lb containers.
The tablet feeders will treat approximately 3 million liters of potable water before refilling of the disinfection tablets is required. Feeder tubes may also need to be cleaned yearly. The LF Series Tablet Feeders have a minimum 10 year limited warranty.Interview with representative
1 to 50 mg/L Chlorine residuals for up to 3 million liters of water can be achieved depending on the dosage used and the flow rate of the water to be treated before refilling of the disinfection tablets is required.Interview with representative
The International Rural Water Association (IRWA) has tested and recommends Norweco’s Bio-Dynamic Tablet Feeder Disinfection System. It has been tested in remote rural locations in Honduras and El Salvador.Interview with representative
South Putnam Public Service District potable water treatment plant
Internation Rural Water Association
Chlorine tablets must be handled using rubber gloves to avoid chemical contact with skin when loading and refilling tablet feeders.
Pre-filter and safe water storage tank
Although they do not evaluate this specific product, Henderson (2005) found that chlorine tablet feeders may be more effective than hypochlorinators in supplying clean water in rural, resource-poor settings and possibly serve as an alternative technology for water disinfection. They also require less frequent maintenance, repair, and replenishment of chlorine.
Sustained effectiveness of automatic chlorinators installed in community-scale water distribution systems during an emergency recovery project in Haiti. Journal of Water, Sanitation and Hygiene for Development, 2016. Reasons why the chlorinator project did not achieve intended sustained effectiveness included: lack of accountability for infrastructure maintenance; lack of tablet access; and lack of effective community management systems. We recommend future implementers of centralized water treatment systems in relief-to-recovery contexts consider these three components necessary for sustainability.
Norweco’s Bio-Sanitizer chlorine disinfection tablets comply with NSF Standard 60: Drinking Water System Components
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