@Abdullah - crystallization temperature depends on the c-chain cut of the product. Normally it is mentioned in the product specification or technical data.
The higher the C12 content the higher the crystallization temp. Common grades with a share of C14 shall be kept above 20°C.
Crystallization is reversible but product needs to be carefully heated to ~40°C while gently stirring. Local overheating needs to be avoided, because normally at temp 50°C and higher the products can start degrading and once this process started it can speeds itself up (pH decrease is a good measure for this).
Anyway, ALS can also form crystalls below 15 - 20°C and needs to be reworked in the same way as SLS.
I am not aware that powders are available. I only know of 70% pastes but they are not too easy to dilute.
But as mentioned supplieres information normally describes all this for their grades.