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I've called both the PUR and SweetWater companies, discussed with their
tech-reps about checking their filters using a dye. Both do not recommend
the dye test, it is used to check the integrity of the charcoal filtering
used in the First Need. PUR and SW do not use a charcoal final filter,
therefore the dye test does not validate the filter. Both companies said
when the pumping gets hard; replace the PUR cartridge, try cleaning the SW
cartridge before replacement. IF in doubt about the filtering, replace...
If you want more info:
I've never used an MSR Waterworks, can't respond to it...
"WIXeR" AT-94 GA>ME
" I'll get there,,,, when I get there.!!" obscure