Mixed salt water turned cloudy overnight

[marioannou]

So I mixed up some salt water with fritz rpm salt yesterday in the afternoon and by the night it was clear. Was lazy to do a water change and was planning to do it this morning but woke up to extremely cloudy water. Any ideas as to why? Is this safe?

 

[The_Paradox]

Probably calcium precipitation. It’s fine to use and will clear pretty quickly.