We only use quality chemicals from LoChlor and AquaPro.
If you had a race car, would you use a No Name brand oil in your engine after you spent many thousands?????
Like wise with salt. Some other lesser quality salts may trick you are getting more for less with a 25kg bag, but you are buying water and impurities.
Our salt is refined, dried and sized for very fast dissolving, less chance of staining with no mineral impurities. The bag states 20 kg you are getting 20kg of salt not moisture.
If in doubt, try a bag of each.
Watch it dissolve before it hits the floor.