Re: [DIYbio] reverse osmosis systems for autoclave and microbial purposes

On 10/30/2014 03:06 AM, Tom Hodder wrote:
> On 29 October 2014 19:13, Nathan McCorkle <nmz787@gmail.com <mailto:nmz787@gmail.com>> wrote:
>
>
> On Wed, Oct 29, 2014 at 5:32 AM, Tom Hodder <tom@limepepper.co.uk <mailto:tom@limepepper.co.uk>> wrote:
>
>
> I was wondering whether anyone had any comments, or experiences of RO filter systems for use in a microbial lab..
>
>
> I wonder if you would need to backflush with sterile water, to prevent contamination


In the 7 filter diagram, the central filter has a four way valve, (not diagrammed obviously),
that is for back flushing. The others never have a flow reversal.
Since other filters and UV light follow that, the occasional
contamination from back flush water still gets filtered out or flows out, and any
salts could be dumped by running the output into the drain for
enough time after doing a back flush.

The diagram suggested no back flush -- to me it looks like a suggestion of
replace per 2 years running. anyhow, whenever changing connections, it's probably
a good idea to divert the output to waste for enough time to purge it.

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