Sewage is a subject to take very seriously. I can't say that it works badly, but it gave off odors, sometimes it leaked, I estimate that because of the joint between the tank and the outlets. I have removed it. Possibly it worked well for others. I am not entirely satisfied.
After proper installation, it was discovered after 2 months that the connections mounted in the tank had become leaky. I expected much better quality for this price. Or was it a “Monday product”?
Used as a black water tank aboard a Sunbeam 34. Torn during a close leg between the Scillys and Kinsale. A disaster. The flange of the fittings has come unstuck. Don't buy! Very bad solution. Don't buy that! Awfull job..