I used two 55 gallon drums, one for Black and one for Grey.
The drains are plumbed with separate valves to use the same Stinky Slinky, I drain the Black first then Gray to rinse out the hose.
I also added a valved cross connect near the top, this serves two purposes, if one of the tanks gets too full I could open the valves and drain some from one tank into the other (have not had to do this yet), the other purpose is I added a hose connection in the middle to flush either of the tanks when needed.
To answer Gary’s question, if I were to do it again, I would probably do it exactly the same.
I also have a cover for the drain that allows a regular hose to attach if I should want to allow the gray to just drain out (have not had to do this yet either).
Peter
