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Pant
PostPosted: May 15th, '19, 15:56 

Joined: May 15th, '19, 15:29
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Location: Toronto
Does anyone know if oyster shells will work well in a flood and drain system?
My interests are in finding free lite weight media for my AQUAPONICS SYSTEM.
I'm also thinking walnut shell might be good.
Any suggestions good people?
Thanks
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PostPosted: May 17th, '19, 16:03 
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Joined: Dec 1st, '18, 23:55
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Oyster shells are mostly Calcium carbonate,it will buffer the systems PH.But I've read that once the waters PH reaches 7.2 it stops :dontknow:.You would want the PH a bit lower than that (depending what plants you're growing).

Walnut shell,I don't know exactly what it is.Is it inert & will it rot?
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