11-26-2006, 10:46 PM
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Some sands contain silicates. I would put in a water in a tank with a powerhead and test the pH after a day or 2. This lets the CO2 gass out. Otherwise, if you test your water immediately, you may get a different reading compared to waiting a day or 2 later. After the 2 days, pour the sand in there and test the pH again after a couple of days. If the pH rises, then there's a possibility that the sand does contain silicates that could cause your pH to rise. If it doesn't or you like the high pH, then make sure you pour some bleach in the water and let the water circulate to make sure you kill any other nasties in the sand.