yea you are correct.the sistem does 5ppm and then adds back 15ppm of something its not much but its supposed to make the water taste better i dont know but i like the idea
Don't use the re-mineralization filter. You can simply leave it off and bypass it.
Remineralization filters add back
unknown amounts of calcium, magnesium,
and other minerals, making it hard to control nutrient levels precisely.
I have done a great deal of research into this and the overall consensus is to
not use the Remineralization filter for hydro or aquariums.
You can see by the results of my grow that I know somewhat about what I'm
talking about. (Now if I could only get a spine and lung transplant so I could
stand up longer & take better control of this overgrown jungle)


ps. Oh, they are slow. You'll need a garbage can or barrel with a float switch.
I run an air stone & small circulation pump in mine which keeps it nice and
fresh and oxygenated. Maybe overkill, but it works.
I also have a sump pump hooked to a smart wall outlet that I can turn on
and off with a phone app. The pump has a lay flat garden hose attached,
running from my bathroom to my grow room. (the hose was $50 bucks,
made by gorilla, and is soft and lays flat when not in use, I just leave it
stretched out), I go through 10 gallons per day and about 60 gallons on
"flush day"; this setup makes it very convenient as I am unable to carry
full 5 gallon buckets any more; hell, I can barely carry myself.