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I wouldnt use the waste water for anything but washing clothes or lawn watering. It isnt anything more than tap water with a little higher concentration of the stuff that we dont want in our tanks, but I dont want that little extra in my body and I dont want to taste it either, our tap water is nasty as it is. You may as well treat your fresh water fish to the good water since you bought a system.
Most membranse over 75 GPD arent as efficient, most 100 GPD membranes are around 92% or so while 75GPD are 98%. I think There is a higher GPD unit that is as efficient (or close) as the 75's but i dont recall who makes it.
You can go up to a 75 you just need to get a 75 gpd flow restrictor as well when you replace the membrane.
Pressure will increase when your filters get dirty and clog.
45 psi is low or atleast on the low end of ok for the ro membrane. Water production quantity will be lower and efficiency also drops when the pressure is too low. Check the minimum operating pressure of your membrane. I think that you may be borderline at 45 psi.
Im sure one of the ro experts will chime in and elaborate for you.
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