Coffee grounds ok for black/ grey water tank?

[kyle4501]

Do you guys realize how much nerve it takes to look in your tank through the dump valve.

No problem for me, I use a mechanic's mirror on a telescoping stick.

In addition to avoiding an unpleasant misshap, I don't have to bend over (there ain't enough air down there to breathe even if the tank doesn't leak!) 

[Oregonconversion]

Well I hope I dont screw up my valve. I have always tried to get MOST of the grounds in the garbage, but its kind of hard because I use a french press for my coffee. Some always goes down the drain to get it all out of there.