303 Mold and Mildew Cleaner and Blocker

No, this product is designed for surface cleaning when the hot tub or sauna is empty. You should drain the water before application to ensure the solution can properly treat the surfaces and prevent any chemical runoff into your spa water.

For most applications, you can simply spray it on and wipe it away. However, if you are treating a surface that comes into direct contact with skin, it is good practice to wipe the area down with a damp cloth after the cleaner has done its work.

The duration of the preventative barrier depends on your usage frequency and the environment of your spa or sauna. Generally, regular maintenance applications will keep the surface protected and resistant to new growth for several weeks.

Yes, the formula is designed to be safe for typical hot tub and sauna materials, including acrylic. It effectively cleans without damaging the finish, but always spot-test a small, inconspicuous area if you are concerned about a specific material.

Because this is a surface cleaner intended for use when the tub is empty, it should not affect your water chemistry. Just be sure to wipe the surfaces clean and let them dry completely before refilling your hot tub.