Brightwell Aquatics Strontion Liquid Strontium Supplement, 500 ml

Highly-concentrated ionic strontium solution
Incorporated by corals, clams, and other reef-building invertebrates into aragonite, the mineral that is secreted as skeletal material
Stronger than most competing strontium solutions
Contains no unwanted organic material such as EDTA, gluconate, or polygluconate
Over 50% stronger than most competing products
Free of phosphate, silicate, and organic material
Formulated by a marine scientist