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Here is a recipe I found a little while back on bleaching rock. I personally haven’t tried it but I’m told that it works well. The ratio is a lot stronger than mentioned in other posts but it does use a lot baking soda to neutralize the rock so feel free to adjust the ratios.
3 days 50/50 bleach water
3 days freshwater soak (I do a water change every day, probably unnecessary but can't hurt!)
3 days 2 lbs. baking soda soak
3 weeks drying out
If you use a fan you can speed the drying out process by a week or so.
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