I have / do. I bought a DE filter for my pool this year. Best thing I ever did. Didn't have to add hardly anything for chemicals all year and it stayed balanced (maybe a total of 1 gallon of muriatic acid, not including initial balance in the spring), so it has actually pretty much paid for itself already and required a lot less work on my part. Now, the sand filter I had previously, well, that was a constant pain in the ass.

I'd think something like is shown here would need to be pumped out. Yeah, it takes some time, but in the end, that's going to be the best and quickest way.