Can I use deionized water instead of distilled?
Applies to all systems – HD-500, EA-20, Tesla, Solid State

•   No. Deionized water is so pure that it will quickly extract impurities from the copper tubing, and you will incur water related operational problems sooner than you would with distilled. Always use distilled water. One gallon jugs of distilled water can be purchased at most grocery and pharmacy stores.