I use tap water. I treat it with a product called "Prime".
I used to buy R/O water from Safeway in the big water cooler jugs but got so tired of hauling up the heavy water bottles (4 storey walk up) and I would go through water bottles pretty fast. But then again I do have three tanks.
I do notice over the years that the Edmonton city tap water is not softened like it used to be, its now quite hard. I did also notice in my tank after I started using tap water that I discovered problem algae's. There are a lot of silicates in the water that I learned fuesl the algae.
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