Biguanide Treatment
Originally developed as a pre-surgery anti-microbial scrub, PHMB was patented in
1977, and marketed for pools and spas under the trade name Baquacil. This technology has
the distinction and the EPA approval as the only non-halogen sanitizer available for pools
and spas. Here's a page if you're looking here to find out
how to convert
back to chlorine or some other sanitizer.
Now that the patent has expired, Bio Lab has also introduced a line of biguanide
products under the name Soft Swim. A full system for complete halogen free water care,
these products are a stand alone alternative to traditional sanitation methods. The
Biguanide itself is combined with algaecides and hydrogen peroxide for periodic oxidation.
The system tends to gum up filters, and of course a product is available to de-gum it.
Biguanide are not recommended for spas or aerated pools. As long as you don't add any
other chemicals but those recommended by the manufacturer, you'll do fine; but add a small
amount of chlorine and your pool looks like orange sherbet! Biguanides are also
incompatible with TSP, ozone, detergents, ionizers, and other common chemicals, but is not
at odds with any water balancing chemicals you may add.
Biguanides have been reported to be easier to use, with less chemical level testing,
and less adding of chemicals. The water doesn't smell of chlorine of course, and the
reduced surface tension gives it a smoother feel. It doesn't degrade with sunlight,
temperature, or changes in pH levels like chlorine. At recommended concentrations, biguanides won't irritate the skin or eyes and can't corrode pool equipment.
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