I couldn't be happier with the new pump and filter.
For this 15'x 48" Intex pool, it's plenty and then some to circulate the water.
How do I know?
Well, first off the skimmer pump with a carpy spun fiber cartridge runs for over a week without needing to be cleaned. And then, it's not dirty but full of bugs and hair only. The sand filter is getting it all. Happy dance!
Secondly, the kids bumped the return eyeball so that it pointed the opposite direction. I noticed this because despite the 1000gph skimmer running after being cleaned (i.e. full force) all the leaves on the surface were traveling in the opposite direction. The 1600gph pump completely overrode the 1000gph, turned the water on itself and made everything go the wrong direction. Even the pool toys were swirling counter clockwise.
Third... water looks fabulous! Never better.
I knew 1 Intex pump wasn't good enough, which is why we ran two of them. But dang, if I'm not realizing how ineffective even the two pumps were now.
For anyone on the fence about getting a bigger pump and sand filter for an Intex... Jump off. Join the dark side with me. It's very effective!