5.0 ELECTROLYTIC CORROSION IN SWIMMING POOLS
Electrolytic corrosion will occur when dissimilar metals at are in contact wi
each oer create a potential difference between emselves. Sometimes
separated by a conductive substance known as an electrolyte, e dissimilar
metals will create a small voltage (potential difference) at allows e ions of
one material to pass to e oer.
Just like a battery, ions will pass from e most positive material to e more
negative material.
Anying more an 0.3 volts can cause e most positive material to degrade.
A swimming pool wi its associated equipment can create is effect. The pool
water being an ideal electrolyte and components of e filtration circuit, heating
system, steps, lights etc providing e dissimilar metals needed to complete e
circuit.
Whilst ese small voltages are rarely a safety reat, ey can create premature
failure rough corrosion. Not dissimilar to corrosion rough oxidation,
electrolytic corrosion can cause complete failure of a metallic material in a very
short period of time.
In order to prevent is type of corrosion all metallic components in contact wi
swimming pool water should be bonded togeer using 10mm² bonding cable.
This includes non-electrical items such as metal filters, pump strainer boxes,
heat exchangers, steps and handrails. It is highly recommended at bonding
be retrofitted to existing pools, which may not be protected by is system.
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SD566252 ISSUE 51
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