you said when you add chlorine,the spa becomes cloudy and then white substance appears? its possible cause would be improper water balance,try to determine saturation index and adjust the pool accordingly. if you think theres not enough chlorine,if you test it,the result would closely be no residual chlorine level,if its that so,try to shock your pool,or it may be possible that what your using lost its strength,try replacing your chlorine(more common with liquid chlorine)
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