Greetings folks of TFP! I am the second generation operator of a true DIY pool. 25' x 48" plywood construction, sand bottom, lined pool built in 1990 by my dad. He crafted this engineering marvel after we had several above ground kit systems cave in or go to heck and it's been standing proud ever since. Now that the maintenance of it has come on to my plate, I am searching for updated methods of filtration, chem treatment, etc. I imagine that a lot has changed in 25 years and I look forward to drawing on the knowledge of the forum.