Thanks for your time, Dave.

Charcoal filters used in front of RO membranes in most RO systems take out Chlorine. But neither removes
chloramines, thus the need for Amquel/Prime. Regarding dose, read the bottle.

SpectraPure's 5-stage RO/DI units include an optional
chloramine-removal stage... this, of course, is what I have. Do I
still need Amquel?

I choose to use RO water and reconstitute it because I choose to breed sof****er fish in my plant tank.
This makes my life more complicated than those who use nice hard tap water in their plant tanks, since I
must replace nutrients present in the tap water.

What if I'm just concerned about excess phosphates and extremely hard
water? I have both of those here and neither seem like they'd be very
helpful in creating a healthy environment for discus and other
soft-water fish.

Thanks again,

Ben