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Your chlorine is 'locked in' by the
chemicals used to stabilize it. Granular and
tablet form chlorine is bonded to cyanuric
acid to prevent it from being burnt off by
the sun too quickly. But whilst the chlorine
will be used up, the cyanuric acid will
remain. Too much cyanuric acid in your pool
over stabilizes your chlorine and it cant
get free to attack bacteria and algae.
You will have to throw out some of the water
with the cyanuric acid and replace it with
fresh water. Regular and thorough back
washing of your filter should prevent over
stabilization but in a heavily used pool up
to 5%, maybe more, of your water should be
replaced each week to keep over
stabilization at bay.
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