Sorry about the tank issues Joe. Hopefully all is well.
I tossed my Hanna stuff in the useless tank stuff cupboard a few years ago. My Hanna ULR Phosphorus meter was only as good as the reagents...some reagent batches were useless.
I use Salifert for most of my tank parameters. They are very cheap too.
I dont trust Redsea test kits either...plenty of bad reviews over the years on UK forums on some of the kits.
Salifert, Elos and API are my chosen brands.
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