Our Two Step Systems Cleaner is Awesome.Step 1: Fill the container with Hot Water to dissolve powder inside, and add directly into undrained Recirculating tank. This strong cleaner will clean your system very well. Step 2: Fill the container with Hot Water to dissolve powder inside, and add directly into undrained Recirculating tank. This will decalcify, neutralize and condition your entire system and bring it right to the optimal pH for starting fresh. "Step 3": Just drain your system and you're ready to go.