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What one dose does
PARAMETER
1 g / 100 L
Alkalinity
+0.4543 dKH
To raise alkalinity by 1 dKH in 100 L: 2.2 g.
How it’s used
Dissolve before use. Basic: 2 g (~1/2 tsp) per 20 US gal, dissolved in 8 fl oz fresh water, every other day to hold 7-12 dKH. Precise: grams = US gal x dKH rise x 0.089 (or x meq/L rise x 0.25).
Cautions
• Do not add undissolved powder directly to the aquarium.
• Contains carbonate, borate and bicarbonate salts; harmful if swallowed.
Sources
Two manufacturer figures differ slightly: stated 12 dKH per g per US gal vs EZ-calculation factor 0.089 g/gal/dKH (=11.2 dKH per g) and 0.25 g/gal/meq (=4.0 meq/L per g). Stored the explicit 12 dKH figure; an app may prefer the 0.089 factor (more conservative). Brightwell's page lists liquid sizes (250ml/500ml/2L/20L) for this powder, apparently a copy error; sizes below are from retailer listings (Kraken Corals 250 g, AquaCave 500 g and 20 kg, ASAP Aquarium 1 kg).