Flourite causing increase in hardness? - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 04-12-2006, 03:36 PM Thread Starter
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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?

Thanks,
Mark
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post #2 of 4 (permalink) Old 04-12-2006, 08:01 PM
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Flourite has never affected any of the 3 tanks I've used it in. Nor is it supposed to.

However, I could see suspended flourite particles (it is pretty dusty stuff) causing false readings for a day or two after setting up a tank with it.
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post #3 of 4 (permalink) Old 04-12-2006, 08:09 PM
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I've never noticed this, however I'm using close to using liquid rock, and anything leeching slowly wouldn't be noticed anyway.

6 ppm of KH is ~.33 degrees of hardness, which IMO is almost nothing.

Do you have a bit of a brown tinge to your water? That could explain the TDS (if that means Total Dissolved Solids) reading, Flourite dust.

Try putting some tank water into a white cup, and see if clear.

Also what type of material are you running in your filter?


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post #4 of 4 (permalink) Old 04-12-2006, 08:46 PM Thread Starter
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I agree that the KH is currently negligible. Even the GH of 46 (as of this morning) is not so much. It just bothers me that there's anything there at all let alone that it appears to be increasing, given that Flourite is not supposed to cause this. It will be interesting to see what it is when I get home from work...

I did rinse the stuff pretty well. The tank filled quite slowly from the RO/DI filter - it took about 36 hours - so it never really clouded up. I've had the pump running since Sunday evening. It uses a Pentair Aquatics (aka Rainbow Lifeguard) AF-94 Double Mechanical Filter which supposedly filters below 20 microns. The water is crystal clear.

As an aside, I wonder if dust would cause a TDS reading. My understanding of that (which I admit is marginal at best!) is that it really shouldn't. And remember that my chemical GH test gave an identical result to the meter...

Mark
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