I had a Pentair Quad 100 installed 2 weeks ago. Every time the pump comes on, I get a light cloud of DE at the return jets. It's particularly obvious at night with the pool lights on, where I can see a faint "cloud" in the pool itself. It primarily shows up, however, in the spa as an obvious haze, and I can see a bit on the floor of the spa after the water settles.
If I filter the spa for a while, it completely goes away, but once the pump has been off for an hour or so, the cloud/haze comes back again when the pump is turned on. I expect this to happen for a littlewhile after putting new DE in a filter, but after two weeks I'm starting to wonder. My previous filter -- a regular DE "grid" type filter -- only did this for a few days after replacing the DE. I never saw this behavior after two full weeks before.
Is this normal, or should I start looking for a problem, like a hole in one of the Quad cartridges? Are there any specific places I should look for a breech in the filter? Is it possible that the DE that the installers used was "finer" than the DE that I had previously used, and is pushing through the filter too easily? I always thought that all DE was pretty much the same.
Thanks for feedback on this,