I run a RO/DI filter with a 11 gallon reservoir. Unless its smaller than a water molecule and the DI does not pick it up. Its not getting through. The annual co

I run a RO/DI filter with a 11 gallon reservoir. Unless its smaller than a water molecule and the DI does not pick it up. Its not getting through. The annual cost is about 30 dollars to replace the various filters and media. Plus you have 99.9% pure water at your disposal at all times for making drinking water, carbonated water and base water for anything where you need to know the chemical composition. (saltwater fish tanks etc.). I highly recommend it!