Do you have a K2006 test kit? (If not, get one) Note that the HTH kit tests TOTAL hardness, rather than CALCIUM hardness.
Check the calcium, pH and alkalinity levels. My guess is, you may be seeing calcium attaching to the SWCG plates and then flaking off when the unit reverses polarity.
+ Here are links to the kits we recommend:HTH 6-Way Test Kit @ Walmart
Taylor K2006A (3/4 oz bottles) @ Amazon
Taylor K2006C (2 oz bottles) @ Amazon
Bookmarks