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I'm looking for an RO/DI unit for my home. Not just for my fish but for me and my other animals as well. I don't trust the LFS since last time I used their 'RO/DI' water I ended up with flatworms.
As silly as it sounds I built my own at left over parts around my home and stuff from my job.
I make glasses and there are non prescription lenses that are a standard round shape. I took one of those, cut it down to the right size, and used super glue to adhere it to a piece of PVC.
Total...