Quote Originally Posted by mas985 View Post
Sorry but I have to disagree with this. There are some fundamental differences between a AG pump and an IG pump. Most AG pumps are NOT self priming so would not work on an IG pool at all. Also, the rating of AG pumps tends to be much higher than the equivalent IG pump. For example, a 2 HP Optiflo (AG) has about the same flow rate as a 1/2 HP Northstar (IG) so you need to be really careful about using an IG pump on a AG pool because it could very easily exceed the maximum flow rate of the filter.
mas985 is perfectly correct. However, I use the Hayward Superpump 1hp 2spd with a Hayward 200# top-mount sand filter and have for a dozen years with no problem. I could use it with a bigger filter and if I ever have to replace the filter I will. However, with my pump you cannot safely use a smaller filter. In-ground pumps are usually "full-rated" and AG pumps are usually "up-rated", meaning loosely they are assigned more HP than they have. More simply, a 1hp up-rated will not flow nearly as much water as a 1 hp full-rated.

Sunny, I'm going to say it again: Please check your information before you post it.