Hello, all. I've been in my house 9 years, now, and the pool has had a crusty old Pentair 8000 series DE filter. The filter itself worked great, creating stunning pool water clarity. It could clear a cloudy pool in about a half a day.
I could no longer find parts for it so I replaced it with a brand new Hayward Pro-Grid DE4820. Other than the new filter, no other changes were made to the system. The new filter, along with a new 6 position multi-port valve have been installed for 8 days, and I'm not seeing the clarity that I used to.
The pool water is not dirty but it just doesn't have the glimmer it once had. At night, with the pool light on, there are obvious "plankton" like particles that can be seen reflecting in the light. During the day, it's obviously nowhere near as clear as it used to be.
As per the directions, I added 6 lbs of DE powder. The pressure reading on the gauge is 8-9 lbs. Is this the best it can do?
Is there a reason why my new Hayward can't even come close to matching my old relic?
My old filter was about half the size of my new one but I was told by several sources to buy the largest filter you can afford, and that under-sizing was an issue, not over-sizing.
My pool store told me from the very beginning that I needed to add 7 lbs of DE powder to my old filter every time it's serviced. It now seems strange that a filter half the size of my new one, would take MORE DE powder. 6 lbs. of DE doesn't seem like a whole lot of powder for this monster.
Also, some say the basic rule of thumb is to add 1 lb. for every 10 SF. That would put my new filter at 4.8 lbf of DE! That doesn't sound right. Anyway, the manufacturer says 6 lbs. and that's what its got. Any answers? Thanks.