Controlled reef chemistry starts with the right dose.

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Hydroshock 3-Part Complete System

Sale price $45.87 Regular price $50.97

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Hydroshock 3-Part Complete System

CALCIUM | ALKALINITY | MAGNESIUM

The Hydroshock 3-Part Complete System is a precision-balanced dosing trio designed to provide reef aquariums with stable water chemistry, consistent growth, and vibrant coloration. Formulated to work together in a 1:1:1 ratio, Hydroshock maintains the proper balance of major and minor ions while preventing long-term imbalances.

  • Hydroshock Calcium (Part 1) | Calcium • Strontium • Trace Elements
    Supplies concentrated calcium enriched with strontium, potassium, and trace metals (iron, manganese, zinc, vanadium). Promotes strong skeletal growth while supporting natural coloration and trace element balance.
  • Hydroshock Alkalinity (Part 2) | Carbonates • Boron • pH Stability
    Provides 8,400 dKH total alkalinity, replenishing carbonate consumed by coral growth. Boron buffering stabilizes pH and reduces daily swings, protecting corals from stress and enhancing growth.
  • Hydroshock Magnesium (Part 3) | Magnesium • Potassium • Iodine
    Maintains ionic balance by replenishing magnesium at the correct ratio to calcium and alkalinity. Includes potassium and iodide for invertebrate molting and soft-tissue health, plus balanced sulfates to preserve the natural Na:Cl:S ratio.

Together, these three parts form a complete reef foundation system, giving your aquarium the stability corals demand to thrive.

Balanced 3-part dosing system (Ca : Alk : Mg)
Supports skeletal growth, coral coloration, and invertebrate health
Prevents ionic drift and maintains natural seawater ratios
Save when purchasing the full Hydroshock system as a bundle


Instructions

  • Begin dosing at 1 mL per 100 L daily of each part (Ca, Alk, Mg) in equal amounts.
  • Test regularly for alkalinity (dKH), calcium (Ca), and magnesium (Mg).
  • Adjust all three parts slowly and equally to maintain stability.
  • If a parameter drifts significantly, temporarily adjust that part alone before resuming equal dosing.
  • Dose into high-flow areas. For larger alkalinity corrections (>0.5 dKH/day), split into smaller doses or drip overnight to prevent pH spikes.

1 mL of each Per 1 US gallon:

  • Calcium (Ca): +15.85 ppm
  • Alkalinity (Alk): +2.22 dKH
  • Magnesium (Mg): +3.20 ppm
  • Chlorine (Cl): +36.42 ppm
  • Sulfur (S): +1.46 ppm
  • Potassium (K): +0.777 ppm
  • Strontium (Sr): +0.313 ppm
  • Boron (B): +0.231 ppm
  • Fluorine (F): +0.036 ppm
  • Iodine (I): +0.030 ppm
  • Zinc (Zn): +0.00203 ppm
  • Molybdenum (M): +0.00200 ppm
  • Iron (Fe): +0.00172 ppm
  • Manganese (Mn): +0.00172 ppm
  • Vanadium (V): +0.000147 ppm
  • Cobalt (Co): +0.00010 ppm

Storage & Safety

  • Store sealed in a cool, shaded location (≤25 °C).
  • Protect from direct light.
  • Shelf life: 24 months.
  • Not for human consumption.
  • Keep out of reach of children.
  • May cause eye and skin irritation. Avoid contact with eyes, skin, or clothing.

Reefkeeper reviews

How do I know how much 3-Part to dose?
Asked by Amit
Answer:

Start by testing your alkalinity, calcium, and magnesium, then use the Reef Charge Dosing Calculator to estimate your dose based on your tank’s actual water volume and target levels. For maintenance dosing, begin with 1 mL per 100 L daily of each part in equal amounts. From there, your dose should be adjusted over time based on your test results. For example, if your goal is to keep alkalinity at 8.3 dKH, test your alkalinity weekly. If your alkalinity is below 8.3, increase your daily dose slightly. If your alkalinity is above 8.3, decrease your daily dose slightly. As your corals grow and colonies get larger, they will naturally consume more alkalinity, calcium, magnesium, and trace elements. In a healthy growing reef tank, it is normal for your daily dosing amount to slowly increase over time.

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