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The flow rate through the filter will slow down over time as the biolayer develops and sediment is trapped in the upper layer of the sand. For turbidity levels greater than 50 NTU, the water should first be strained through a cloth or sedimented before using the BSF.
The treated water should be collected by the user in a safe storage container placed on a block or stand, so that the container opening is just under the outlet, minimizing the risk for recontamination.
Maintenance is required when the flow rate drops to a level that is inadequate for the household use. Swirl and dump maintenance for the top layer of sand is simple, takes a few minutes and can be done by household users. The frequency of swirl and dump depends on turbidity of inlet water. The outlet, lid and diffuser should be cleaned on a regular basis.
The outlet should also be cleaned regularly using soap and water or a chlorine solution.
====Manufacturing====