Overview
Two Little Fishies Kalkwasser is a high-purity calcium hydroxide powder formulated for reef aquariums and the calcifying livestock they house. Mixed with purified freshwater, it produces a limewater solution that supplies calcium and alkalinity in balanced proportions to support SPS, LPS, soft corals, clams, and other invertebrates. It is a dependable, repeat-purchase consumable for stores serving serious reef hobbyists.
Key Features
- High-purity calcium hydroxide for reliable results
- Delivers calcium and alkalinity in balanced proportions
- Helps stabilize pH in marine systems
- Ideal for kalk reactors and auto top-off setups
- Supports coral skeleton growth and reef vitality
- Trusted, high-demand reef consumable
Specifications
| Spec | Detail |
|---|---|
| Size | 1 lb, 4.4 lb |
| Brand | Two Little Fishies |
| UPC | Two Little Fishies Kalkwasser |
About Two Little Fishies
Two Little Fishies is a long-respected maker of reef-keeping supplements and equipment. Visit Two Little Fishies.
Frequently Asked Questions
How is it prepared?
Dissolve the powder in purified freshwater to create a limewater solution that supplies calcium and alkalinity.
Can it be used with a kalk reactor?
Yes, it works well in kalkwasser reactors and ATO systems for steady dosing.


























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