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 Post subject: Bleach in the greenhouse?
PostPosted: Mon Mar 30, 2015 10:04 pm 
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Joined: Wed Jul 19, 2006 10:59 pm
Posts: 345
Location: La Conner, WA
What is a reasonable concentration of bleach I can use in my greenhouse that will kill algae but not hurt my Phals?

David


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 Post subject: Re: Bleach in the greenhouse?
PostPosted: Tue Mar 31, 2015 5:01 am 
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Joined: Fri Sep 17, 2010 7:52 am
Posts: 313
Location: Oak Island, NC
I used one ounce per gallon (1:128) of ordinary household chlorine bleach (5.25% sodium hypochlorite) for years, then switched to Physan at 1 teaspoon/gallon (1:768). I later found that Biosafe Disease Control (formerly labeled as Zero-Tol) is far superior to either of them, as it has demonstrated absolutely no phytotoxicity whatsoever.

However, I have since observed that algae growth has been greatly reduced (dare I say "almost eliminated"?) since I cut back on my fertilizer concentration and started using a low-phosphorus formula (K-Lite).

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Ray Barkalow, Orchid Iconoclast
Using science & logic to improve orchid growing


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 Post subject: Re: Bleach in the greenhouse?
PostPosted: Tue Apr 07, 2015 3:51 pm 
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Customer

Joined: Wed Jul 19, 2006 10:59 pm
Posts: 345
Location: La Conner, WA
Thanks Ray. I have some of the first generation Zero-Tol and haven't found it particularly effective. I'll try some old-fashioned bleach and 1 ounce per gallon.

David


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