Hardened calcium nitrate

[Gilda]

Can it still be used ? TIA

 

[Ozpaph]

if it disolves

 

[gego]

Cal Nit is very soluble in water. Use warm water to dissolve it, stir then pour on final solution

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[CarlG]

If you can dissolve it in water, you can use it.

 

[silence882]

It's fine. Over time, calcium nitrate will absorb water from the air, causing the granules to stick together. There's no harm in this.