Join Date: May 2004
Location: Avon Lake, Ohio
Flourite causing increase in hardness?
I'm in the process of setting up my first planted aquarium. It's an AGA 90 gallon. This past weekend I put in 7 bags of Flourite (which I rinsed pretty well) and filled it with RO/DI water (I live in NE Ohio where liquid rock comes out of the tap).
My plan was to get the pump running for a day or so, get my GH and KH where I wanted, and then make sure the CO2 system (and everything else) was working reliably before adding anything alive.
In preparation for adding chemicals I stuck my TDS meter in the tank last night, expecting to see a reading of near zero (my RO/DI water comes out of the filter with a reading of 0 or 1). It read 37. I then tested the water with my Hardness Test Kit and got an identical result, so I'm assuming it's accurate. Out of curiosity, I also tested KH and got a reading of about 6. (All these readings are ppm, not degrees.)
This morning, about 12 hours later, I again used the TDS meter in the tank and got a reading of 46. Since there is nothing else in the tank, it seems to me as though the Flourite is gradually leeching something into the water.
Has anyone else experienced anything similar, and if so, how long did it last? Any other explanations for what I am seeing?