I routinely clean our boiler with Antiformin S (Caustic/chlorine mix, 2% @ 78c) recirculated through a sprayball including through the HEX. This is recirculated for about an hour before being washed and flushed with hot clean water.
I've recently noticed quite a significant change in colour around the bottom half of the tank, a sort of rainbow effect, particularly rising from the two elements, iridescent maybe?. It disappears when wet. Any ideas what it could be and if it's worth worrying about? I've only been here since February and the kit is 8 years old. Reasonably sure the previous brewer didn't caustic clean that much.
I've recently noticed quite a significant change in colour around the bottom half of the tank, a sort of rainbow effect, particularly rising from the two elements, iridescent maybe?. It disappears when wet. Any ideas what it could be and if it's worth worrying about? I've only been here since February and the kit is 8 years old. Reasonably sure the previous brewer didn't caustic clean that much.
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