Please help me pick a new DE Filter

[BigDave]

Yep, that's how you install it. If you got the model for horizontal flow then make sure it's pretty close to vertical when installed. Install the meter where there is at least 10 x the pipe inside diameter before the meter and 5 x the pipe id after. Be careful when you drill to cut only the hole you need, there's not alot of extra for the gasket to seal on the sides. The instructions should specify the hole size.

[CarlD]

I'm stunned that a 325# sand filter is too small for a 1hp pump and 18k pool!

I suspect you are going at it all wrong because that filter should EASILY be more than adequate, even oversized. I run a 1hp (full-rated) pump with a 200# sand filter and 19,000-20,000 gallons with no problems at all. I have a two speed and full speed isn't a problem.

So...it could be a damaged or defective filter, multivalve, or pump. Or the whole thing isn't plumbed correctly. But there's no way a 325# filter should be too small for any 1hp pump. So I'm thinking you are looking in the wrong place for your solution.

[TheGoose]

OK, here's what I have done since yesterday. I was gone until late last night. I stopped by Wal-Mart (at 4 am!) and bought 13 174 oz jugs of Great Value bleach.

When I got home I added 10. I wanted to super-chlorinate the pool, and I did. According to my calculations, this would put me at ~50 ppm FC from my level of 5.

Today, the water looks much, much better. Apparently, even though I *thought* I had shocked it enough, maybe I didn't. I'm not gonna yet say that it's clear, but it's better. More importantly, there was a lot of "junk" on the bottom that I vac'd to waste. I assume that the shock levels precipitated something out.

Also, I checked the spider gasket. Everything appears to be normal there.

On a side note, I went by the pool store to pick up filter sand (what a rip!- $15/bag). I picked up 3 bags of sand to top off the filter. Pentair spec's say that the level should be 10" from the top so that's what I'm gonna do. For giggles, I let them test my pool water. I looked at their tester, but I forgot the name. Basically it takes a single cell of pool water for each chemical. Most of their results were somewhat close to mine, with the exception of CYA. They showed 10, I measured 40 yesterday. I told her about my persistent cloudy water and her answer was basically that I may have to live with it because there were a lot of people with cloudy water this year! She did try to sell me this and that but I always have my Std. answer: I already have it. And I let them think I bought it from them.

[TheGoose]

Oh, and BTW, I tried to test for FC and CC but stopped at 30+ ppm. I really wanted to know what my CC was, but I'm almost out of reagent, as you can imagine after 60 drops.

Is there a way to test the FC using 1 drop = 1 ppm? Maybe have 5 ml of water instead of 10?