Originally Posted by ynot1500
Does anybody know how to stop a re-occurrence of the problem?
Rinse it out by running clean water through the tank--which you should do to get rid of sludge anyway--when you know it won't be used again for a while. Best if it's fresh water (most pumpout facilities do have a hose you can use for this), but even sea water is better than nothing. Put the water into the tank via the deck pumpout fitting 'cuz that sends it into the tank at the bottom so it can stir up sludge and hold it in suspension so it can be pumped out and/or dumped via the onboard pump. It's not necessary to fill the tank, just a few gallons is enough. If you're at a pumpout, you'll have to pump out, then repeat till you're pumping only clean water before you can flush out the Whale...add a few gallons, then let the water run while you operate it. You can use a washdown pump if away from the dock...add a few gallons, then let the water while you clean out the pump. However, it's a good idea to follow up a sea water rinse with fresh water because salt and sea water minerals need to be flushed out too.
It's especially important to thoroughly flush out the tank and plumbing in preparation for winterizing.