Sand Filter - losing sand when backwash?

[a21filly]

I have a sand filter that was installed last year. Whenever I backflush the filter after vacuuming - it also discharges some sand. Is it supposed to do that? And how do I know whether it has lost too much sand? Is that possible ?

[Pool Filter]

After filling a sand filter it is normal for the filter to expel excess sand during backwashing for a few times .

If this continues you have a problem. The most common reasons are:
1) the diffusor on the top of the vertical pipe in the filter is faulty or wasn't put in;
2) the collectors at the base of the sand filter (under the sand) are cracked, broken or loose;
3) the sand filter is too small for the pump.

Hope this helps.

[Guest]

sand level was low and small amounts of sand was coming out of jets, have put in new sand but water seems to be coming out of filter around the middle working ok but why is water coming out

[colin hasler]

sand level was low and small amounts of sand was coming out of jets, have put in new sand but water seems to be coming out of filter around the middle working ok but why is water coming out