I have a 12x36 intex frame pool. For the first year, I used the pump that came with the pool. Not sure exactly but I believe it was less than 1000 gal/hr. Not as good as I wanted but I tested and adjusted my water daily and never had water issues. After that a friend who had a bigger intex and got a new pool gave me their pump. It is either 1000 or 1500 gal/hr. Same hose fittings so I know it was not a lot bigger than my first one. It did a better job but I still would like even better.
My goal is to upgrade the pump to either a much larger cartridge filter or possibly an intex sand filter, but it is not in the budget right now though I am closely monitoring Craigslist for a used one.
I remember a few people on here hooking two intex pumps together to run at the same time. Is this a good idea? If so, what would I need to connect them? Completely hardware-and-diy-challenged here so if anyone knows links to pics or anything that would be great, though any thoughts or advice is appreciated!