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When adding chemicals to your waste tanks, be careful not to use any product that has formaldehyde. In order for your tanks to work properly they need to have bacteria in them to help dissolve the waste. Formaldehyde kills these beneficial bacteria. It is also detrimental to the septic systems that you dump your tanks into. If a park septic tank is contaminated with too much formaldehyde due to campers dumping their tanks the park owners may be forced to have the tank pumped and cleaned; a very expensive operation.