The last time I dumped my tank was April 2006. I do not have a flo clear because I do not need one. The only thing I am using for filtration are some 20 Micron filters. I have changed them once since April 2006. We print 300 and 350 lpi every day. If I was going to have any trouble it would rear its head with the Hi lpi screening. I would not recommend this unless you have control of your variables.
Wow! More than a year without dumping a fountain solution. The thing that makes this so unbelievable ( I do believe thought) you are only using 20 micron filters. My guess to your success is that a lot of fountain solution is transferring to the paper and vaccuming the pans at the press regularly or something like that. So in reality you are slowly changing your fountain solution. At best a nominal 20 micron filter could delay a change by a week at best and stop some sediment build up in the fountain solution. Also you must be using extra biocides or UV light after two months even with refrigerated circulator.
As for conductivity I can come into your plant and completely destroy your fountain solution chemistry without changing your conductivity (it's ability to carry electricity). Conductivity is just a guide to determine how dirty your fountain solution is. What do I start at? and when do dump? but it is not perfect. If you use both pH and conductivity you would have a more accurate guide to determine to dump.
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