After the filter has been backwashed, the filter valve is switched back to filter and the DE is added to the skimmer. The amount of DE to use should be shown on the filter and depends on the size of the filter area. The DE should first be mixed in a bucket with water then poured into the skimmer with the filter running.
Firstly you find out how the DE got into the pool - must be a broken filter pad. Fix that, then vacuum the pool. No point vacuuming before you fix the filter problem, or the DE will finsih up back in the pool.
Salt is not a filter, it is added to pool water to allow a chlorine generator to operate.
I assume you have a sand filter if so you most likely have broken laterals in your filter. A lateral should allow water through but not sand. if you have a DE filter and you are getting what appears like sand in the pool, you have one or more of the filter grids that have holes and the DE is passing through the filter grids back to the pool.
How do you back flush a pool filter?
A backwashable DE Filter. Diatomaceous Earth is the proper name.
broken filter grid
Check the grid and manifolds for holes or cracks.
You back wash a pool filter not a pool pump. Read your manual. Call the pool store with the brand of filter and back wash valve that you have and they will advise.
???? Refer to: Poolspa.com
Simply put, Diatomaceous Earth (DE) are the bones of tiny little animals that lived millions and millions of years ago, diatoms. This DE is used to coat the "grids" inside the DE filter which captures and filters particles as small as 5 microns. When the filter pressure rises, the swimming pool DE filter is backwashed in the same manner as a sand filter. A slurry of DE is put into the skimmer to "recharge" or "re-coat" the grids of these swimming pool DE filters. This type of filter is effective and efficient but a little more expensive to maintain. Some call it the "water polisher" of pool filters.
Better people than me can explain this. Try troublefreepool.com. I'm figuring you're asking this because you have a DE filter. Basically there is a "cloth filter" in the DE filter. Then (after it has been cleaned and hosed off of all the old DE etc.), you put the appropriate amount of DE into your leaf basket at the pool when the filter is running. The DE will dissolve into the water then collect on the surface of the filter. After that only very small particles (like water etc.) can make it through the filter, which now consists of DE and the filter itself.