Welcome! While you are working on the construction aspects, take the opportunity to do a lot of reading here on the forum and also on our sister site www.poolsolutions.com . Doing this will answer a lot of your questions and also probably generate other ones. I would also suggest going ahead and ordering a good test kit. We recommend the Taylor K-2006 or 2006C which is the same kit with larger quantities of some of the most used reagents. That way, when your water is in the pool, you'll be ready to test.

Put the phosphate remover on the shelf or give it back to the dealer if you can get a credit for it. You don't need it. After doing some reading, come back with questions. We'll help you get your pool going!