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Joined: Jul 2002
Posts: 2
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Joined: Jul 2002
Posts: 2 |
What things should I consider regarding inflow of household grey water into a fish pond?
What is greywater? Any water that has been used in the home, except water from toilets, is called greywater. Dish, shower, sink and laundry water comprise 50-80% of residential "waste" water. This may be reused for other purposes, especially landscape irrigation.
How can I determine if "biodegradible" soaps and detergents would harm fish?
Thanks
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Joined: Apr 2002
Posts: 68
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Joined: Apr 2002
Posts: 68 |
This is only a guess but I would say that the phosphates in the "greywater" will promote excessive algae growth. There is also the probability that you will introduce undesirable chemicals into your pond.
Larry
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Joined: Jul 2002
Posts: 2
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I've done some further searching on this subject. One thing I've found in a few places is a warning that even biodegradable soaps are harmful to fish. Something called "surfactants" present in even biodegrabable soaps and detergants. excerpt from http://lists.saveourshores.org/pipermail/sos/2002-June/000002.html All soaps and detergents even the biodegradable ones, are toxic to fish and other aquatic life. The "surfactants" in most liquid detergents and shampoos is called sodium lauryl sulfate which destroys the oxygen exchange in the gills of fish. "Biodegradable" detergents still contain surfactants. In their water quality testing procedures for safe release of treated water or "effluent", the local sewage treatment plant, sewer authority midcoastline, uses the harmful sodium lauryl sulfate as a reference toxicant for our LD(Lethal Dose) 50 sensitivity check of their bioassay fish. The dose at which 50% of the fish die ranges from about 17 PPM (PARTS PER MILLION) to 30 PPM.I'm sure the volume of discharge and volume of water probably make a difference, but I guess I won't fool with it.
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