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in other words
and glass test tubes
It provides aragonite based inorganic minerals
Do not exceed 420 ppm on a regular basis or significant precipitation will occur
Seachem PhosGuard 2 Liters Calcium Supplement in other wordsRemoves silicate and phosphate. Spherical for optimal hydrodynamics. Irreversible binding. Overview: PhosGuard rapidly removes phosphate and silicate from marine and freshwater aquaria. Although PhosGuard is effective in both fresh and marine water, it will operate better in sea water and the need for it is better defined in sea water. It is not recommended for phosphate buffered freshwater (PhosGuard would remove the buffer until saturated).