I never even heard of that ! Sounds a lot safer than Phosphoric Acid . The well water here is pure hell as it is . I think I'll have to use bottled water though . The Alkaline is so high in suspension that our swamp cooler pads only last about 2/3's of the season . I'm sure the Alkaline was the main cause of my first grows demise . This group is far better at 6 weeks than anything I've tried in the past . Thanks !