Just wanted to take the time to tell the people behind this website thank you very much. I have hade our pool going on thirteen years. The first year our water was so awesome you could almost see yourself in it. Steadily over the years the water has gotten to a level of clean but it wasn't the same. Since getting to this website last week and learning what to do and what test kit to use. We have that water again. So thank you I can not wait for it to warm up and enjoy it.