This is a great thread ! But I have a question...
For those of you using the containers that only have the small little black 6" circular port-hole on top, rather than a full size removable lid, How do you clean the container and keep it free from build up over time ?
The only build up you get is in the mix tank and its a hard build up like coraline algae. I've cleaned mine once with vinegar and a high powered hose but it didn't do much.
It doesn't effect the mix in the tank. I know guys that have had their tanks for years without cleaning so I don't worry.