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-   -   sterilized lava rock (http://www.hydroponicsonline.com/forums/showthread.php?t=24)

GregB 01-28-2009 08:18 AM

sterilized lava rock
 
Hi Ron!
Its me again, Greg B. in Fort Lauderdale Fl. I asked you about the lava rocks, and you suggested
that " I sterilized because of the toxins that pure lava rock has. I would water every 20 minutes or so
for 5 minutes and maybe more often." How would I go about sterilizing them? They are growing
tomatoes just great but the ph has to be adjusted every day because it goes way up. I am adding
asprins to control it but I am afraid that it will do harm to the plants. Has lava rocks got the acid 'built
in it or something? anything I can do to get rid of it?

Thanks a bunch, your friend in Florida Greg B.

Ron 01-28-2009 08:20 AM

You can clean them with a 10 percent bleach solution or cook them in an oven at 250 degrees for an hour.
Ron


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