Long Term Carbon Use???

[100fuegos]

I have been using a HMA style water filter (fifteen stages by now, one 1 micron pre filter and fourteen CTO) for more than five years now with absolute no ill effect. I change 100 % of the water at least for fry and juveniles, less after one year.

[pitdogg2]

I Agree with Willie. Back in the mid 80's i was raising Schmidt-Fock Discus in straight RO. My pH was 4.5-5.5. My plants (hygro) grew fine my Discus did as well. I used second nature 7acres carbon by the gallon. If any of ypu remember this carbon you'll know it was very fine pebbles. The proper amount had the surface area of 7 acres. (I never tested that)
Point being not once did i have any HITH or pitting problems. My problem was not enough tanks and too many on eggs. Then kids came along and put the kybosch on my disposable income.