Hello and thanks to all in advance!! Going to use this apparatus for first time in order to clean out my black tank, do I also clean out the grey tank? When flushing, do I have just the black tank...
Here's how I flush my black tank, I fill up two five gallon buckets from the shower spray, go out and open the black tank valve listen to it flowing, go back in and dump the two buckets down the toilet, go out and close the valve. Takes longer to fill the buckets than to flush.