Myka, you are right, there is a small square paper with the small hole. I did not know what it was so I threw it away. Could not find it... I hope it does not affect the test too much.
Tailor Aquatics also makes K in very high concentration (5ml per 100gal once a week; however, they don't specify the quantity of dosing). I assume it is high concentration. 500ml bottle is less than $20.
I agree with you all, the KZ K is the way to go
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