| I just realized ... many of you more experienced orchidists (is that right?) may have used bleach many times to clean lava rock with no problems, and without any neutralization step. So the trace amounts of chlorine left may not be of a high enough concentration to cause problems ... but I am sure you can not rinse the odor off of it with just water. (The trace odor would be deadly to fish.) I would think the neutralization step would be a cheap, easy insurance step to protect our prized orchids. A bottle of the water conditioner (~$7 for 6 oz. bottle) would last a long time and would be enough for many treatments. It is what I would do ... but I am just a rookie. Good luck.
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Wieb |