You could possibly do it in some places, like around Vancouver since I hear some people there are getting 1-10 TDS out of the tap. Use a TDS meter on your tap water. The higher it is the faster it will consume your deionization resin. Normally a membrane will drop your TDS to 4 or less at the cost of the waste water. If your TDS is +50 your resin will deplete very quickly. You have also interested me if anyone in a low TDS situation skips the membrane, and how long their resin lasts on average.
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