Originally Posted By: Hikin_Jim
Originally Posted By: paramedicpete
Quote:
I'd want a backup method in case it broke or failed.


Seems to me the only way you would know it failed is if you become ill with a water borne agent. wink
Yep. There's no reliable way that I've ever heard of to test a filter unless you've got access to some sophisticated lab equipment. There's no "home kit" that you can buy.


The First Need XL comes with a test dye. Add a few drops to your source water and pump through the filter. If the output water has any blue tint the filter needs to be replaced.
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