Reef Charge | SKU: RC-HS-MAG-16

Hydroshock Magnesium | Part 3

Name: Hydroshock Magnesium | Part 3
Rating: 5 (3 reviews)

$16.99

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(3)

Size

16 fl oz 64 fl oz 128 fl oz

Pickup available at New Dawn Aquaculture

Usually ready in 1 hour

MAGNESIUM | POTASSIUM | IODINE

Hydroshock magnesium is a carefully balanced magnesium supplement formulated specifically for reef aquariums, completing the 3-part dosing system alongside Calcium and Alkalinity. Hydroshock Magnesium supplies magnesium at a controlled rate, about one-fifth of the calcium added by an equal dose of Part 1, preventing depletion without excessive buildup. A precise blend of sodium and potassium sulfates maintains the natural Na:Cl:S seawater ratio, while added iodide supports soft-tissue health and healthy molting in reef invertebrates.

Directions / Mode d’emploi

DIRECTIONS

USE

Part 3 of 3. Dose equal volumes of Parts 1, 2 and 3 daily.

DOSE

Start at 1 mL of each part per 100 L (26 US gal) daily. 1 mL per 3.785 L (1 US gal) adds about 3.18 ppm magnesium. Test magnesium regularly and adjust all three parts together.

LIMIT

Also adds iodide. For large magnesium corrections, use Magnesium 12+.

CAUTION

Dose into high flow. Never mix concentrates. Store sealed, cool (≤25 °C) and dark.

For aquarium use only. Do not ingest. Irritates eyes and skin. Keep out of reach of children.

MODE D’EMPLOI

USAGE

Partie 3 de 3. Doser chaque jour des volumes égaux des parties 1, 2 et 3.

DOSAGE

Commencer à 1 mL de chaque partie par 100 L (26 gal US) par jour. 1 mL par 3,785 L (1 gal US) ajoute environ 3,18 ppm de magnésium. Tester le magnésium régulièrement et ajuster les trois parties ensemble.

LIMITE

Ajoute aussi de l’iodure. Pour les fortes corrections, utiliser Magnesium 12+.

PRUDENCE

Doser dans un fort courant. Ne jamais mélanger les concentrés. Conserver fermé, au frais (≤25 °C) et à l’abri de la lumière.

Pour aquariums seulement. Ne pas ingérer. Irrite les yeux et la peau. Tenir hors de la portée des enfants.

Ingredients

Purified RO/DI water
USP-grade magnesium salts
USP-grade sodium & potassium sulfates
USP-grade bioavaible iodide

Storage

Store tightly sealed in a cool, shaded location (≤25°C).
Protect from direct light.
Shelf-life: 24 months.

Safety Information

Not for human consumption.
Keep out of reach of children.
Causes eye and skin irritation.
Avoid contact with eyes, skin, or clothing.

Choose a parameter

Select the result from your latest test.

Selected parameter

ALK Alkalinity

Reference range 7–13 dKH

Why it matters

Carbonate buffering and daily calcification demand.

Your aquarium

Example values are marked until you change them. Use your actual water volume and measured readings; changing the parameter or product keeps the volume you entered. Daily dosing recommendations appear with your result.

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Recommended formula

Enter measured values

Review the suggested values or enter your own, then calculate the amount and dosing recommendations.

Reefkeeper reviews

5 Based on 3 reviews

5/5 Evan Cross Verified buyer Jul 5, 2026

Magnesium

This magnesium has been great, I'm happy with this 3 part

5/5 Carly Ballou Verified buyer Jul 5, 2026

Hydroshock

I’m dosing all 3 bottles of Hydroshock, my corals have been much happier. I like it better than a 2 part.

5/5 Matthew Fersch Verified buyer Jul 5, 2026

HydroShick

Love the 3 part dosing for when my mag needs that little more that the 2 part dosing.. great stuff

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