Filter Pressure Increasing After Backflush

[DH]

Hi Everyone,

I have a one year old, in ground pool and spa with a DE filter, using cellulose fiber. I cleaned my filter within the last two months. I noticed that the water features and spa spillway didn't seem to be flowing as well as they should. On checking, the filter pressure was up near 28-30 psi (the "dirty" range). When I back flushed the filter the pressure dropped to the clean range but returned to high pressure and poor flow after 45 minutes to an hour. I've repeated this a couple of times. I disassembled the filter to look for obstructions. I cleaned the filter and removed some wadded cellulose fiber which I thought would solve the problem. I assume there is an obstruction somewhere in the lines that is moving when I back flush. It may be wadded cellulose fiber somewhere but I'm not sure. I'm guessing the next step is to try to back flush the lines from the skimmers (there are 2) two the filter using a shop vac. Is there a way to do that? I assume that there is some sort of check valve that would be in the way. Any ideas would be greatly appreciated.

Thanks,

Doug

 

[linen]

When you have repeated re-cleaned the filter, is it dirty? Sometimes fast filter clogging is a sign of organics in the pool.

 

[DH]

It was dirty but not like it was on the previous cleaning. Would organics in the water cause such a large swing in filter pressure in under an hour after back flushing? Thanks for the input.

 

[Bama Rambler]

If you have a active algae bloom it can clog a DE filter in short order. What does your water look like?

 

[DH]

Water is clear and no problems maintaing FC. It looks like the problem is solved. I back flushed it again, this time for about 15 minutes. The pump pressure is down and staying down. I'm not sure what was stopping things up but it looks like it cleared. Thank again for the input.

Doug