About This

• Uses UV Light Directly — Not Indirectly — Other "solar pool sanitizers" use sunlight to power ionizers or generate electricity to create UV light mechanically. Our BioPhotonX UV light conversion film directly converts UV sunlight into sanitizing energy at the point of contact with your water. Pure solar-to-sanitation efficiency.
• Reduce Chlorine by 50%+ — Maintain clean, balanced water while cutting chemical use in half. Enjoy a healthier, more comfortable and enjoyable swim with less odor, irritation, and dryness.
• Covers Up to 15,000 Gallons — Perfect for most residential pools and hot tubs. For larger pools, simply add an additional FIN per 15,000 gallons.
• Simple “Drop-In” Use, Minimal Maintenance — Balance your water, place the FIN in your pool, and let the sun do the work. Gradually reduce chemical use over a few weeks—no complicated setup required.
• Natural, Gentle & Eco-Friendly Solution — No metals, no additives, and no harsh chemicals. Just a clean, sustainable water care method that’s safe for families, pets, and the environment.
• Making Water Care Safer — Made in the USA, Card on Guard and our BioPhotonX UV light conversion film technology are finding ways to leverage solar energy to reduce the use of chemicals everywhere.