Originally Posted by harley
off topic , but earlier you stated that the black tank was also open ....keep that one closed till at least 1/2-3/4 full.
hope you find the drain problem.
X2. Black tank should be kept closed with at least a few gallons of water in it at all times to prevent the dreaded stone mountain from building. If not at least 2/3 full when ready to dump, then fill with water until 2/3 full before dumping. Dump tank, flush until clear, then close add 3-5 gallons of water and desired tank treatment (I recommend the Geo method
.) I usually use what's in th d grey tank to clean my drain line out after dumping black tank. Some keep grey open all the time, I prefer to keep it closed until full.