I wanted to share my experience today that totally convinced me to ditch the test strips. I had two different test strips (Porpoise and hth). Both of them tested a solid 3 chlorine. Took sample to the pool store and my chlorine was a 1! They even tested twice to double check. I immediately went and bought the intermediate kit (hth 6-way) that this forum recommends (the other more advanced kits recommend intimidate me a little). Anyway, I wish I had ditched the strips a month ago when I found this forum. This new kit is spot on! This forum has helped me soooo much! Never thought I'd ever get such a charge over water! I think the pool stores are the best 'reverse advertisement' for this forum and all you teach. I fought with this water for 10 months and could never get nice, clear water. I found this site and switched to BBB and within 3 days my water was beautiful! And it's so simple! The pool store employee was giving me their spill today, I just shook my head and said 'thank you' and walked out. Knowledge (and experience) is power! Thanks, guys! I'm now a confident, BBB spa owner, thanks to you! Now I can enjoy this beautiful spa!