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  #1  
Old 5th July 2012, 12:00 PM
Andrew F Andrew F is offline
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Default RO water instead de-ionised water

Living in an area of very hard water I have been using de-ionised water to mix up DD23 and my paper developers. A freind suggested it would be cheaper to use RO water which is available locally at 10p a litre.

Does anyone use RO water to mix up chemicals?

Andrew F
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  #2  
Old 5th July 2012, 12:46 PM
Luis Luis is offline
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There is no problem about using it for most formulations, as you are going to buy it, anyhow RO for a single home installation plus water wasted in the process won't make it cheap. I'd look for a second hand water distiller in that case.
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Old 5th July 2012, 09:35 PM
cesare cesare is offline
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Andrew,

I guess you are able to get it from a tropical fish supplier? It's often used to fill tanks, and I guess it is perfect for photography. Sorry, not used it myself...
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Old 5th July 2012, 10:28 PM
Terry S Terry S is offline
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Here's a good set of answers:

http://photo.net/black-and-white-pho...g-forum/004gDc

Terry S
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Old 6th July 2012, 07:14 AM
Dave miller Dave miller is offline
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Our requirement is for clean water that has a fairly neutral Ph. Commercial developers are designed to work in a wide range of Ph conditions so water Ph is not normally an issue. Removing dissolved minerals from the water is the main issue for us.
For convenience I use an in-line water filter that was sold to convert tap water to drinking water, not that ours needs converting. The unit came with a natty little tap and cost about £30 with a couple of spare filters. You can use deionised, distilled or R.O. water if these are more convenient for you, for our purposes they are equal.

I use filtered water to dilute my developer and for the final rinse of negatives, for the remainder of my processes I use straight tap water.
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Old 11th July 2012, 06:35 PM
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alfie alfie is offline
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I use cooled boiled water for making up developers, no oxygen left in it after boiling. I have some ID11 that is still good after over a year.
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