Sorry for forgetting that you use RO water, Ken!! How soon we forget our mentors! I just changed all the filters because I was seeing white spotting on a few large catt leaves and it had been 2 years. We have very hard water. I used to use rain water as well but with 500 orchids now, I would need a tank and pump like Ursula. The system works great. I probably do waste my well water though. I believe that the plants are much happier with the RO water.
