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Is RO/DI water required to avoid streaking?

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I noticed on product page it asks for RO or DI water. I do not have access to that. Will distilled water work or is the RO or DI much preferred?

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RO, DI water are always recommended but not necessary - Opti-Clean softens all but the hardest water for safe wash.

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To my understanding; Distilled water is a purer form of water (less contamination) than DI or RO water. Thus it should perform even better than DI/RO for dilution?

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either DI and RO water are more pure than simple distilled water (they are different ways of filtering but similar results).  ONR softens all but the hardest water, but it never hurts to go the extra mile. 

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21 hours ago, Ron@Optimum said:

either DI and RO water are more pure than simple distilled water (they are different ways of filtering but similar results).  ONR softens all but the hardest water, but it never hurts to go the extra mile. 

I'm not sure I agree with that...since DI is an ion-exchange process and RO is a membrane filtration process, my knowledge is that neither of them will provide an end product that is as "pure" as properly distilled water, although the goal of all 3 is largely the same.  There are pros and cons to each method which would lead you to choose one over the other in an industrial or business setting, but for the OP's use distilled water is a more than adequate solution; many detailers use distilled water from the supermarket at $1/gal for waterless and even rinseless washing.

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FYI
 
 
 
 
Deionized water is as pure if not sometimes purer than distilled water, which is also a form of water purification done through boiling and steaming. DI water working in conjunction with an RO system is what gives the potential of DI water to be cleaner than distilled water.

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RO and DI together, that's a new one on me.  I'll stick by my advice to the OP that he should get a jug of distilled water at the supermarket before he invests in a DI tank and and RO system.

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I agree with your suggestion and admit I rarely use distilled water...guess everyone has their own definition of obsessive.

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