All - If using HCamper, mix up the powder with water before putting into drain/WC, make sure it's all been absorbed into the liquid. It works great, but it is abrasive to electric valves, i.e. drain master ones in my case, replaced two of them, now when using HC make sure it's a liquid solution before I put into tank. New Coach came with Thetford chemical in pods, which I used with great results, by filling bowl and putting on the side, letting them dissolve, and swishing around the bowl (also cleans bowl too), and once all liquid, flushed and was done.
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