larz1
Koi Kichi
Jul 29, 2007, 8:19 PM
Post #26 of 26
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Re: [pvonbarg] Problem with green water and high ph
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I mentioned in my last post the problems ponders run into when using chemical treatments for algae, especially "AlgaeFix".
An old member of this forum (who just happens to be a successful Koi Keeper AND a professional chemist) recently posted this on another forum. I thought it might be an eye opener about chemical controls for algae and Koi health.
(Excerpted from KoiPhen Forum post by Dr. Roddy Conrad)
" Before you start reading, the definition of the term LC50 is that half the kind of fish die on average at this dose rate and time interval. Just so you "get" the discussion.
From Toxicity Studies for Poly(oxyethylene) (dimethylimino) ethylene (dimethylimino) ethylene dichloride (active ingredient in AlgaeFix) on Fish - Toxicology studies from the primary scientific literature on aquatic organisms in the PAN pesticides database, the primary active ingredient in AlgaeFix is rated to have the following LC50 concentrations:
48 hour LC50 for channel catfish is 3 ppm
96 hour LC50 for bluegill is 0.2 ppm
48 hour LC50 for trout is 0.04 ppm
AlgaeFix contains 4.5% of the active ingredient Poly(oxyethylene) (dimethylimino) ethylene (dimethylimino) ethylene dichloride according to the MSDS (Material Safety DataSheet) for AlgaeFix.
The recommendations for dosing AlgaeFix are to dose a gallon of AlgaeFix for each 38,400 gallons of water to kill algae.
To dose one gallon per each 38,400 gallons is to dose the product at a dose rate of 26 ppm, but the AlgaeFix is just 4.5% active ingredient, so the recommended dose rate of the active ingredient in AlgaeFix is 26 ppm times 0.045 = 1.18 ppm.
This is 40% of the LC50 for channel catfish, but is 6 times the LC50 for bluegill, and is 30 times the LC50 for trout. So if AlgaeFix is dosed at exactly the recommended dose rate, we should expect all the bluegill to die, all the trout to die, and some of the channel catfish to die. Just so you "get it".
And this is the RECOMMENDED dose rate, and we all know too well how products are sometimes used in ponds.
So it is no wonder a lot of folks kill their pond fish with AlgaeFix.
Okay, AlgaeFix kills algae. So does either hydrogen peroxide or sodium percarbonate..."
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