What tester should I get? TF-100? The Taylor K-2006C test kit is for saltwater pools and ours isn't salt water.I see the pics now.You have a standard pump and sand filter. That's fine. But you also have an ionizer that will add copper and do basically nothing to help with sanitation. Why they are sold is still a mystery, but you need to use liquid chlorine to keep algae away and manage your water properly. The proper test kit, along with balancing FC to the current CYA as noted on the FC/CYA Levels is key.