@bronze @sjw Honestly it's the storage tank that concerns me the most, but the general strategy is to do periodic teardowns and sanitize everything in the system. You flushing the system before using the water that comes out is also a thing if you're after exceptionally low tds, like to preserve the resin in an ro/di system, but you can't exactly just flush the toxins accumulated in the storage tank since that defeats the purpose of storing it in the first place.