15,000 gallon in ground vinyl pool
Hayward Superpump 1 hp.
Pentair FNS DE filter
Pentair chlorine feeder
1 1/2 inch pipe
When the pump starts, I get a green/white jet out of each return for 10 seconds, and over time I get a little pile of sediment on the pool floor five feet from the returns. And it doesn't really filter very well...takes a long time to clean the water of algae. So something is wrong.
It has worked well in the past, but I have not been very good about covering the equipment in sub-freezing temperatures lately...maybe something has cracked. I just replaced all the grids and the manifold, and the big star-shaped gasket in the multivalve. No difference.
Then I re-installed the grids and manifold twice just to make sure I did it right. It is perfect. There doesn't seem to be anymore parts in the filter or anything else I can do with it.
Can anyone tell me what I should check at this point? I'm out of ideas. Thanks.
(I am planning to move all the equipment to a new location in a few months, so it will be very helpful to find out what equipment can be saved)
(I didn't install the system, so I'm not even sure it's hooked up right. Basically it goes from the pool to the pump--multivalve--filter--multivalve--feeder--back to the pool. No check valves anywhere...?)