CFU count for DI water sample

Hi guys

I was unsure where to put this question -- so here goes.

I have something called an "ELMA" cleaning line, which has several vats for cleaning medical devices. The final vat is deionized water, which is fed from something called an "ELMApur85", which also employs UV-light for antimicrobial effect. I want to check the CFU count in the water in the final vat, but I cannot find anything regarding the limits of CFUs in deionized water - as deionized water is many things

Is there a guideline or other official information that has 'real' numbers, or just a recommendation?

Thanks for reading!

 

In the USP (US Pharmacopeia) there are 2 monographs I am aware of related to water - one for Purified Water (PW) and one for Water for Injection (WFI).
And USP General Chapter <1231> WATER FOR PHARMACEUTICAL PURPOSES is very informative.
WFI-USP has to be sterile, so no CFUs are allowed. For PW-USP there are 2 versions, Sterile and Non-Sterile, I believe, and I expect the Non-Sterile version would have CFU limits.
The attached images, gathered from the internet recently, may be interesting for you.

 

Here are 2 more images.