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[APD] Potassium Test Kit at Aquarium Landscapes

Has anyone used this kit?

http://www.aquariumlandscapes.net/aquarium-plants/Test-Kit-Potassium.cfm

Do any of the science types know how it works and if it uses a reliable method? I'm not implying it doesn't work, but 'conventional wisdom' says it can't be done.

TW 


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