Semper Fi, Brother. The customer service rep suggested I put enough water in the tank to be able to see it down the hole. That means my tank would always be about 90% full. I'm going to try the dishsoap/calgon method and see how that works out. Fortunately, I can see my tank through a storage door and (if all else fails) I will hunt for a spray attachment and someone who knows about plumbing the thing! I was at Da Nang '65-'66.
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Art & Linda
2017 Windsport 34F
Dangerous in my old age!
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