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pottasium test kits


dbden

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Nope. not possible to test for K as far as i am aware. If you get small pin hole sized holes with brown edges in plant leaves its likely to be lack of K.

There is an online calulator called then fertilator which can give you a good idea of what youe K level is based on what you are dosing...

http://www.aquaticplantcentral.com/foru ... ilator.php

Put your water quantity at the top, what you are dosing in the windows and click calculate, will tell you what you are adding (but dosnt tell you whats allready there, ie whats coming out of your tap)

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