I'm new to pool ownership and have had a green pool several times due to (I think) inconsistent chlorine levels. I purchased the liquidator with the 3/8 upgrade and installed it two weeks ago. After two days I went to check the chlorine level in the tank and noticed that the lines running out of the unit were all white as was the flow meter. I opened the lid to see this film of bubbles approx 2 inches thick. I called Hasa to ask about this and they said that I had a broken lateral in my DE filter, and that what I was seeing was DE powder. I was told by the previous owner that he had put DE in the filter, but once I got it opened, that was not the case. It is a sand filter, and he had used something I'm not familiar with (lagomite?) instead of sand. After cleaning and inspecting all the laterals I found that all the laterals are intact and working properly. I filled it with the proper amount of sand per the mfg specifications and went back to the liquidator. I replaced the lines before the flow meter, but couldn't even see the ball in the meter. I took it apart and found that the residue is actually hard. I tried using a pipe cleaner to get it off but it didn't work. I used a piece of wire and that broke it apart easily, but after just a couple of days all the lines are white and the flow meter is covered again. Whatever it is is actually making the ball get stuck, and preventing it from flowing. When everything is clean I can get 4 on the meter, but right now I cant even see the ball because there is so much buildup. What is my problem? Is it a chemical imbalance?