We have an ionizer but this results in green staining around our liner pool (and swimming costumes turn green) - so most of the year we put chlorine in the pool which keeps green staining away. But recently we had brown staining on the pool liner which was removed with ascorbic acid but the brown staining has returned. Is this because we are using chlorine and ionizer is present (as the water still goes through ioniser chamber even though the ionizer is not switched on)?
The brown stain might be caused by the ioniser that deposits Iron metal in your pool, you need to clear the stains using ascorbic acid, then consider reducing iron metal levels in your pool by draining and refilling a portion of your pool water or use a metal remover such as ProTeam Metal Magic to remove metals through the filter and avoid brown stains when you shock your pool or when pH is low.
Updated on June 16, 2020
By Barack James