ELOS KH, goes from Bluish to yellowish. At least for me that is what I see, as I use the same kit. Add one drop at a time, then swirl until it goes from the bluish to the new color... Take the number of drops and then divide by half.
To make your kit last longer, I actually fill the vile with half the required water it wants, then add drops until the color change. The number of drops is the value of KH... I have done this for quite awhile and sure stretches the kit out longer.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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