I just called the store that installed my pool to find out exactly what "Micromatic Media" is. I wanted to put in some DE to shine up the water even more. I read not to use DE in ZeoSand. Was leary of putting it in.
They Said: I have a "Micromatic Filter" and it is just regular pool sand and DE is OK to use. By the way I see you haven't bought your water in to be tested yet this year. Be sure to bring in a sample for us to test.
I did change out the sand once (before TFP) and it did not look like sand to me. Do you think I need to open it up and take a look at what is in there?