Hello. I found this site the other day while researching pool chemistry. This will be our 3rd season with our 12' x 18' x 4.5' above ground pool. I am going to make a strong effort to stay on top of my pool chemistry this year so I'm not constantly trying to fix problems or turn the kids green again . I already have some questions regarding test kits and will post those in the appropriate forum. From what I've seen of this site and this message board there are some very knowledgable folks who are more than willing to share what they know. Thanks and I look forward to being a part of this board.