Experience Crystal Clear Water

Water care is much easier with our optional SPA FROG^® in-line system. It makes daily water care simple, so sit back and relax in the swirling warm water of your Caldera^® spa. SPA FROG uses a combination of specially-formulated minerals and bromine, to help ensure your spa water is soft and crystal-clear. Just open the SPA FROG cap, insert the mineral and bromine cartridges, close the cap and SPA FROG will continually dose the water, so it's always working for you.

Another water care option is the high-output Monarch^® Corona Discharge (CD) ozone system. It operates continuously to mix highly concentrated ozone with the water as it travels through a contact chamber, reducing the need for chemicals. Organic contaminants are instantly oxidized, helping to keep the water clean and fresh.

SPA FROG Replacement Cartridge

Our custom SPA FROG bromine and mineral cartridges are only available at your local Caldera Spas dealership. The purple bromine cartridge contains 200 grams of bromine, so it lasts longer than standard SPA FROG bromine cartridges. The blue mineral cartridge contains the only type of minerals compatible with bromine, and reduces the total amount of bromine required.

Monarch™ Silver Cartridge

The use of silver ions inhibits the growth of bacteria and reduces daily spa water care for naturally fresh water.

MPS Non-chlorine Oxidizer & Test Strips

Use in conjunction with ozone and Monarch silver cartridge to help maintain sparkling clean water in your Caldera hot tub.

Monarch MPS Plus^™ non-chlorine oxidizer with aromatherapy helps keep the spa water crystal clear, and enhances your hot tub experience with pleasing scents, all in one convenient product.

Monarch 5-Way Test Strips

Use these test strips to check for levels of chlorine, bromine, pH,
alkalinity, and total hardness of your spa water.

Replacement Filters

Our specially designed, genuine Caldera replacement hot tub filters provide the best fit and performance for your spa.