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Did a review of it on insta.
https://www.instagram.com/p/B_ISNOtB0AO/?igshid=5mfa3nd2514z
The instructions need updating as both the dry time and the flushes are too short.
Try the second strip, see if it dries a darker colour, setting 4 makes sense for the water supply you have. ( same as at FCP) and after 2/3 jugs past the prime it should settle in and be working at optimum levels. If you’re getting a new filter I’d got for 4/5 rinses right off the bat.
Dan, did you let the strip fully dry before setting?
And how many rinses of the filter did you do?