If the tank in question has been used for some years without a good cleaning performed every year or two, it may be time for some maintenance. Tanks develop build up a layer of "settled material" that over time compacts, getting denser and eventually becoming the consistency of hard clay. It becomes so dense that regular service won't remove it.
We've seen tanks that have had their capacity reduced by 50% because of this build up. There are only two ways to solve this problem.
The first requires cleaning through small inspection ports in the top of the tank (if you have them or are willing to install them) and removing the waste by manually.
The second way is to perform an enzymatic cleaning that will liquefy the built up waste and render it removable. It just so happens that we offer such a treatment! Our enzymatic cleaning utilizes naturally occuring enzymes to clean the tank without all the muss and fuss. It cleans any tank level monitoring equipment in the tank as well.
The tank is partially full for 7 days while the enzymes work their magic, but after that the tank will be much fresher and its capacity restored. We call it the Cluster Buster, contact us to set one up!