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Big Red is right calgon is just a water softner and is great for helping remove scum. used to use it to clean dug wells. Us rver need to take care on the amount of bleach we use in our tanks. Yes it will remove the smells but it will kill the biological action and if we all used bleach and where dumping into a park that had a septic system we could cause them real problems. I am a maritime chief engineer and we have to process our own sewer and chlorine bleach is a big no-no.
Just another thought.
Mel
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