Two changes I recently made are:
I changed my canopy to 3" 12v fan, 2 of them, to replace the 110v 4" fan, the 4" fan was loud compared to these, these are silent, and they fit perfectly in back of canopy. I also change my kalk delivery from a kalk reactor to a rubbermade 35gallon holder. Should make things a bit easier, the 35 gallon container of kalk/ro water should last 10 days, that ii about how long my kalk reactor lasted , but this is easier to make.