DIRECTIONS: Shake well before using. Five days prior to changing your spa water, remove the filter(s), add one full bottle of the Penetrating Spa Cleanser directly to your existing heated spa water regardless of what products you have previously used.Two (2) bottles are suggested if the spa is over 5 years old or over 500 gallon capacity. Circulate a minimum of 8 hours each day for 5 days. Drain spa and flush with clean water. Clean filter(s) separately. Spa should not be used during the cleansing process because of contaminants and residues from spa plumbing, fittings and equipment. The Natural Hot Tub Company Water Treatment and Conditioner is the original all natural enzyme product that cleans, softens and conditions your spa water leaving your skin feeling silky-smooth with no odors. Developed for the chemically sensitive, the natural power of enzymes keeps your spa water clean, clear and soft for up to 3 months. The Natural Hot Tub Company Water Treatment and Conditioner has medical grade lanolin to eliminate dry, irritated or itchy skin making it a luxurious experience. One 16 oz. bottle treats up to a 500 gallon spa and helps stabilize pH and alkalinity and reduces or eliminates the need for many additional spa chemicals. Directions: Shake well before using. A garden hose carbon block pre-filter is recommended when filling your spa. Flush garden hose first, then fill spa and heat to 90 degrees or above. Add ½ bottle for spas up to 250 gallons and 1 full bottle for spas up to 500 gallons every three months. Helps maintain pH at 7.2 to 8.2 for enzymes to work properly. Rinse your filter(s) weekly or as needed. Shock weekly or as needed. Our product is compatible with bromine, chlorine, ozonator, non chlorine shock (MPS) and UV systems. To be more environmental we suggest using Spa Chlorine Granules (99% Sodium Dichlor) as a shock, because this particular type of chlorine quickly dissipates in hot circulating water.