Lovibond® Water Testing Tintometer® Group

PHMB

PHMB (Polyhexamethylene Biguanide) is a non-Chlorine bactericide developed for use in private swimming pools. It has algistatic properties, but it must be used in conjunction with specified algicides to minimise the risk of the growth of the more robust strains of algae. Monthly oxidising with Hydrogen Peroxide is also required.

Many pool owners welcome an alternative to the established halogen treatments, although it must be emphasised that PHMB and Chlorine are not compatible and should not be mixed in pool water. In fact, it is vital that all traces of Chlorine in a previously Chlorine treated pool must be removed before any PHMB is added; this is caried out using Sodium Thiosulphate. Also, it is not recommended for use in pools fitted with an ozone device. Special versions exist for spa/hot tub use.

PHMB is cationic and so acts as a flocculant in the pool. Backwashing of the filter more frequently is thus recommended.

References:

Photometers
Photometer Code Type Wave length Range
213070 Pool Direct 2-60 mg/l
210070 Multi Direct 2-60 mg/l
214065 Pool Maxi 620 2-60 mg/l
214025 MD 610 2-60 mg/l
214070 Pool Maxi 630 2-60 mg/l
214140 2-60 mg/l
 
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