Ever wonder how water at the hot springs in Glenwood Springs is filtered?

By Elaine Tassy
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4min 38sec
GLENWOOD HOT SPRINGS FILTRATION
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Debbie Hunsaker enjoys a drenching from a waterfall in the Yampa Mineral Springs pool at Glenwood Hot Springs, July 26, 2025.

GLENWOOD HOT SPRINGS FILTRATION
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Glenwood Hot Springs is believed to be the world’s largest hot springs pool, founded in 1888. About 3,500,000 gallons of water flow through its systems every day.

GLENWOOD HOT SPRINGS FILTRATION
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Brian Ammerman is Maintenance Manager at Glenwood Hot Springs.

GLENWOOD HOT SPRINGS FILTRATION
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About 3,500,000 gallons of water flow through the Glenwood Hot Springs systems every day. Its filtration system keeps the water free of harmful impurities, while at the same time preserving minerals - Boron, Calcium, Chloride, Sodium, Sulfate. Lithium and others - in the water that users believe add a boost to their well being. felt by users to
GLENWOOD HOT SPRINGS FILTRATION
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Filtered water passes through pipes and out into the Grand Pool at Glenwood Hot Springs.

GLENWOOD HOT SPRINGS FILTRATION
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Clear water flows through a decorative feature at Iron Mountain Hot Springs in Glenwood Springs.
Related: What to know about Colorado’s hot springs and where to find them

GLENWOOD HOT SPRINGS FILTRATION
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Rhett Olsen, center, his mom Lori, and dad Todd, of Park City City, Utah, enjoy a soak in one of the pools at Iron Mountain Hot Springs, July 25, 2025.

GLENWOOD HOT SPRINGS FILTRATION
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To keep the roughly 3,500,000 gallons of water properly filtered as it flows through Glenwood Hot Springs each day, glass media and sand is used in its filtration system.

GLENWOOD HOT SPRINGS FILTRATION
Hart Van Denburg/CPR News
Iron Mountain Hot Springs Water Quality and Safety Manager Collin Langer stands beside one of the filtration tanks through which the water flows before it reaches the public pools on the property. The white streaks are from evaporated trace minerals naturally found in the water.

GLENWOOD HOT SPRINGS FILTRATION
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Hijinks off then diving board at Glenwood Hot Springs, which is believed to be the world’s largest hot springs pool, founded in 1888. About 3,500,000 gallons of water flow through its systems every day.

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