How to Filter Water with a Sand Filter - .Przetłumacz tę stronę
Unless the raw water is particularly well treated to about 20 turbidity units or less, this figure should be maintained, unless a very reliable post-ssf disinfection is in place. High turbidity (lots of particles in the water) of the raw water will block the sand filter quicker, shortening the time between cleanings and lowering the water quality.
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