That is awesome for him to do that! What a difference in the tests! At least you KNOW to not trust pool store testing!
You will have to baby sit your pool if you do add DE to the filter. It is not as common as adding it to sand but it might help. Just be ready to shut it down and clean it up if the pressure goes too high.
Kim
You will have to baby sit your pool if you do add DE to the filter. It is not as common as adding it to sand but it might help. Just be ready to shut it down and clean it up if the pressure goes too high.
Kim