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What one dose does
PARAMETER
1 ml / 100 L
Alkalinity
+0.0975 dKH
To raise alkalinity by 1 dKH in 100 L: 10.3 ml.
How it’s used
Dose equal ml of 1, 2, 3A, 3B daily, spread over the day, each separately into high flow. Start 2 ml/100 L each once consumption is measurable; dose of each = dKH drop/day x L / 19.5. Test dKH daily, change all parts together by 10-20% until ~7 dKH holds. 3-part: mix 3A+3B, dose 2x volume.
Cautions
• never mix parts or dose them at the same moment (3A+3B may be combined)
• correct Ca or Mg with single-element powders, not by raising one part
• liquid dosing can raise salinity: if it rises, withdraw 13.8 ml tank water per ml of Part 1 dosed per day
• GHS07 eye irritant (H319)
Part of Core7 Reef Supplements
Sources
Manufacturer constant is for the set: 1 ml of each of 1/2/3A/3B per 100 L = +0.195 dKH ('19,500 dKH per set' = 1000 ml x 19.5). Community RO-water test of the older liquid Core7: 1 ml 3A in 1 US gal = 2.8 dKH (= 0.106 dKH per ml/100 L), 3B = 2.5 dKH (= 0.095), sum ~0.20, so older 3A/3B differed slightly but sum matches. Current Flex 3a/3b are identical (one bag C each). Reef Supplements ("Other Methods") = same kit structure and concentration as Base Elements; only component 1b differs (no Infusion, adapted trace profile).