We moved to Phoenix about a year ago and knew NOTHING about our new backyard pool. I heard great thing about Checker and they seriously are awesome. I take my water sample to them and they give me what I need and clear instructions on how to balance my chlorine etc, and today they installed our new sand filter (replacing the house's 30 year old junker). The tech Warren was nice, quick and SO SMART. I'm talking: he came to check out the system yesterday, gave me a huge range of fix-it options (cheap, moderate and most expensive) and then had me call him whenever I decided. NO pressure whatsoever. Didn't even charge me to come out! THE NEXT DAY (today) he was here with our new system and out within the hour. I am happy!!! POOL LOOKS BETTER ALREADY!