Hi all,
I don't have an API drop test kit, and it would take me a while to get one, but I might do so. You're thinking the GH/KH test set, or the reef master kit?
I don't know of an outdoor faucet, but it is raining currently, so I took a control sample from a puddle:
This seems about what I would expect, so I expect that the test strips are fine.
How does the API liquid dGH test differ, such that it would give a dGH of zero while the A-coop tests give a GHppm of >300?