Just want to say I love this forum. I have an 18k AGP. One skimmer and one return...so no water features. Right now I have a powerline "DB" 1.5hp with a Aquaview 20" sand filter. The pad is right their and is plumbed with 1.5" PVC. Total of 8' from skimmer to return. The water is very clear in the day but skim milk at night with the light on. My OCD has convinced me that it could be better. I keep my water balanced and had no problems last year other than at night with the light on. I learned that my pool uses about 1.5 ppm a day in the hot southeast Texas sun, and could even judge it by the cloud cover. Right now my levels are:
I took my filter apart and pulled out cotton like stuff and washed the sand with a hose. After I started it back up and let it settle I added some DE. The problem is as soon as I started to add it I could see a white haze from the return. I found a DE filter for sale for $350. It's a Hayward EC50C92S 1hp with 3 way valve. The specs show it as 25 sq ft with a flow of 50gpm. What I come up with is 18000gal/8hours/60mins is 37.5gpm. Is the average DE 2gpm per sq ft? If that's right then I would need a min of 18.75 or say 20 sq ft.