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Originally Posted by Johnny Reefer
For alk I use hagen because you just add drops until the colour changes. You don't have to squint at a colour chart with that one. For 1/3 to 1/4 the price of a Salifert kit I think the Hagen Alk kit is sufficient, IMO.
Cheers,
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that's how the salifert one works. you might want to check the accuracy of the hagen kit against a salifert kit, if it's anything like the hagen nitrate kit you probably have no idea what your levels are.