Join Date: Feb 2010
Location: Narragansett Bay
Thanked 379 Times in 358 Posts
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If you can, go with Stainless, but that isn't absolutely necessary. What is absolutely necessary is the largest vent line you can manage. Then, never put any chemicals of any kind in the tank. No deodorants, bleach, soap, nothing. You need good bacteria to break down the stuff and that will over run the smelly bacteria. Any chemicals kill the good bacteria. Also, very important is to flush enough water (fresh or salt) to push all the waste to the tank. This is the typical cause of smells that permeate the waste lines.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.