Funny this should come up, I was just talking to someone at a LFS the other day, they were telling me that they run their RODI water into a storage tank and then through two GFO reactors before running into their mixing bin, I thought it was just a tad OCD...Either way, I just changed the filters a couple weeks ago, tonight I'll pull out my Hanna and check.
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Glass box with stoney stuff and fisches...
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