I have to replace the original pump and filter on our 20 year old inground pool. 18x36 22k gallons, skimmer and main drain with two returns. Anyone have any input on RX clear brand from pool supplies.com?? I'm looking at the 1.5hp vs pump and a 425sqft cartridge filter. I was looking at the calimar pump and a similar filter from pool supply unlimited but the shipping is ridiculous (like $300) and the pump and filter themselves from pool supplies saves a few hundred dollars as well. Just making sure the 1.5hp is big enough, and the brand isn't junk. Both the pump and filter have good reviews. The old single speed pump that is original to the pool is 1.1hp and has worked fine, until it didn't lol. Thank you!