The SweetTank™ concept has been developed to stop odors in yacht and RV holding tanks without the use of chemicals or filters. SweetTank™ is standard equipment on Thermopure-2® Type-I MSD, is optional 

How It Works
Aerobic and anaerobic bacteria coexist naturally in raw sewage, but it is the anaerobic bacteria that produce undesirable odors. By inducing a constant flow of air into the holding tank through a submerged aeration tube, SweetTank™ produces an oxygen-rich environment in which the anaerobic bacteria cannot thrive, thus eliminating unpleasant odors!
The heart of the SweetTank™ system is a compact module that operates continuously to deliver air to the holding tank using less than 3-watts of DC power. For houseboats where AC power is always available, an AC powered SweetTank™ module is offered.

Installation
· STK-18 (Standard Model) aeration equipment fits into any available 1-1/2" NPT threaded fitting in the top or side of the tank.
· If there is no 1-1/2" NPT opening available the kit can be installed into a 2-1/2" hole cut in the tank top or side. Mounting hardware is included.
· STK-18 fits tanks up to 18" deep.
Contact GROCO® for installation in tanks deeper than 18".

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