DE Powder Returning To Pool
by Henry Tefay
(Brisbane, Queensland, Australia)
Recently, after doing a backwash and regenerating my DE Filter with DE powder a little amount of DE returned back into the pool.
However, after opening the pump cover to empty the hair and lint basket and then running the filter again, a lot more of powder ended up back in the pool.
I disassembled the filter, cleaned the grids, couldn't find any tears in the fabric, put it all back again and still had the same problem.
I next replaced the manifold in case there was a tiny crack I couldn't see, inspected the grids again, put it all back again and still have a problem.
I then disassembled again, checked the O ring in the pipe stem and made sure the manifold fitted properly. Still didn't fix the problem.
I had a service guy come to inspect the multifunction valve and he thought it was okay.
I've now run out of ideas and would appreciate any comment you or visitors to your website might wish to make.
Thanks for the question Henry
I know from first hand knowledge that DE filters can be a pain sometimes.
Here is a list of things to look for. This is basic but will give you a good staring point:
Torn Filter Grids - Remember to look at the very end of the grid. Sometimes a small hole will develop on the bottom of the "tube" of the grid.
Broken/Missing Air Relief Strainer
Broken Filter Necks - This is a bit tougher to detect. If the neck of the grid can squeeze together easily, it won't fit snugly into the manifold. This might cause the DE to bypass the grids.
Bad Backwash Valve
Sometimes when the filter is taken apart there's a series of small cracks in the top manifold. It's possible the grids were somehow installed in the wrong order or the wrong positions.
Be sure everything is fully seated down and fits together to ensure a good seal.
Double check that no water is leaking out of the waste pipe when the multi-port is in the filter position.
Hope this helps and let me know how it turns out for you.