Actually it was the aircrete and the limestone creating the problem in his system. And that air Crete was even covered with flex seal, and still found a way to leach into the water..
Provided he did what I told him to do then he never added the calcium carbonate but rather had it on hand to add to the water when the system flips back to the acidic side from CO2 Respiration.
RE: Aquaponics Tips #2