Filter sand excreted during rinse?


New member
May 28, 2010
Just doing my spring opening and I am seeing about a 1/2 cup filter sand come out of the blue waste hose whenever I do a 3 minute rinse, but none during a backwash or during filtration.

Would this be a broken lateral, something else or just the need to gently clean the sand with a garden hose? (Just curious before I dig out 200lbs of sand to check the laterals)



Mod Squad
TFP Expert
Platinum Supporter
LifeTime Supporter
In The Industry
Apr 1, 2007
Sebring, Florida
Since it's only doing it on rinse, there is no need to suspect the laterals. It is very likely a bad spider gasket in the multiport valve. Pretty easy DIY once you get the right gasket.


New member
May 28, 2010
Turns out I was wrong. The water wasn't clear enough yet (was just in the opening process) to see the sand sitting on the bottom of the pool. Once I saw that the spider gasket was still good (thankfully, I have a Sta-Rite model that is now obsolete and would require new plumbing) I opened up the filter and found that 3 of my 8 laterals had come off. Not broken, just come off. The housing assembly that holds the laterals was coming apart, bottom separating from top, so those 3 laterals just slipped right off.

This is my fix, I don't think there should be a problem with it. Does anyone know why this would not work? (I basically clamped around the halves and then cable-tied the rest of the laterals so that they won't come lose again.)