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I'd like to do this but my garage is concrete and doesn't have an epoxy coating nor a drain. I have to wash in the driveway. Nice setup. I'm on the fence about the deionizer because of the cost of the resin. I'd likely want it to funnel through my water softener (to reduce hardness and it can be refreshed if needed) to lower the TDS rating before it hits the deionizer. It's around $150-ish (?) for new resin depending on the size and type of setup IIRC.
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