If you've always wanted a pool in the backyard, this might just be your year. We're not talking tons of money and construction. Just get a stock tank and fill 'er up! It's a trend we're spotting all over Instagram, so we found out how to do it. JJ Lund, with Shade Home and Garden, shares everything you need to consider before you jump in head first. He also shares the best ways to keep the water clean.