Resist is a finely ground granular product that contains Sodium Bicarbonate. Resist raises the Total Alkalinity level in hot tub water; TA in the proper range will maintain the correct pH, and makes the water ‘resist’ changes in pH, hence this Beachcomber name. The TA level governs pH; proper TA both stabilizes and prevents pH fluctuations. Even though this is commonly known as baking soda, Beachcomber’s commercial grade formulation is not for human consumption. The correct Total Alkalinity range from 100 – 120 ppm will prevent pH bounce, corrosion, scaling and staining.