I ran a large calcium reactor for over 4 years on my 240, and it did a fantastic job at maintaining stable levels. However, as your system matures and grows. The volume of effluent increases from a steady drip to a constant stream. This is flurting with disaster..... With an effluent ph of 6.7 being constantly added to your system the potential for a full system meltdown is a very real possiblity, even with the most state of the art controllers the risk is still there. At that time my PH would run a constant 7.8 in the morning and 8.0 in the evening. This is the reason I took mine off line. I went to medical dosing pumps. I figure if its good enough for a hospital, its good enough for me. I am thinking of using it again on a very limited bases. No more than a steady drip to supplement the 2 part I am using.