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Read the manufacturer's manual on the filter. They give specific amounts of sand for each size of their sand filter configurations. I am not aware of any set formula in general. k My Ranger manual states 18" requires 200 lbs of media.
Depending on what type of filter you have. For example, a Hayward S180 uses 150lbs of sand, S244 uses 300lbs. This information is provided on the sticker that is located on the tank of the filter.
Water is coming through the back wash when it is in filter position
where can i find a manual for a swim pro sand pool filter s48c 51201?
Read the manual that came with the product
It depends on what you mean by low. You need to check your filter's manual, and see what level it SHOULD be. Lower than that, usually means you are losing sand into the pool (you'll know!) or when you backwash (because the pump is too big for the filter.) If you are losing sand, you need to correct the cause and then add more sand, after you've resolved the problem.
how do you clean jacuzzi sand filter, and replace sand
Follow the manufacturer's manual. Use #20 silica sand only. Could be 100 or 200#'s ??? k
distinguish between slow and rapid sand filter
Nothing if its a sand filter However if sand is coming into the pool from the filter then you may have to replace one ore more laterals in the sand filter as they have worn and are letting sand through to the pool,
Do you mean how do you install a sand filter?.
differentiate between slow and rapid sand filters