Clear™, EOS O3™, and FROG® @ease
Bullfrog Spas offer several approaches to spa water care, each designed to keep water clean, balanced, and easy to maintain.
While all hot tubs require a small amount of sanitizer, modern systems can dramatically reduce the amount of chemicals needed and simplify the weekly routine. Bullfrog combines filtration, ozone purification, and mineral systems to make spa maintenance straightforward and predictable.
This guide compares the three most common water care approaches used in Bullfrog Spas so you can understand how they differ and which one might fit your preferences best.
How Bullfrog Spa Water Care Systems Compare
Bullfrog Spas offer several water care systems designed to simplify hot tub maintenance while keeping water clean and comfortable. The comparison below highlights how the most common approaches differ.
| Comparison | Clear™ System | EOS O3™ Ozone System | FROG® @ease System | Saltwater Hot Tubs |
|---|---|---|---|---|
| Primary Approach | Low-chlorine sanitation | Ozone purification support | Mineral + SmartChlor® | Salt cell generates chlorine |
| Sanitizer Level | ~0.5 ppm chlorine | Very low chlorine required | Up to 75% less chlorine | Chlorine generated from salt |
| Maintenance | Simple weekly check | Mostly automated | Monthly cartridge replacement | Salt cell monitoring & cleaning |
| Typical Owner Effort | Very simple routine | Minimal adjustments | Cartridge replacement monthly | Regular salt monitoring |
| Water Feel | Clean, light chlorine | Fresh, low-chemical feel | Soft mineral water | Varies depending on balance |
| Corrosion Risk | None | None | None | Possible long-term corrosion |
| Best For | Simple, familiar routine | Highly automated systems | Mineral-enhanced water | Buyers specifically wanting salt systems |
In practice, all three Bullfrog water care systems are designed to keep maintenance simple. Most spa owners spend only a few minutes per week maintaining their spa water.
Clear™ System
Simple Low-Chlorine Water Care
The Bullfrog Clear system maintains sanitizer levels at roughly 0.5 ppm chlorine, which is comparable to drinking water.
Because the system works alongside Bullfrog’s filtration and circulation design, maintaining balanced water usually requires only a quick weekly check.
Many owners appreciate this approach because it combines very low chlorine levels with a simple, predictable routine.
Often chosen by spa owners who want:
• a straightforward water care routine
• familiar chlorine sanitation
• very low sanitizer levels
EOS O3™ Enhanced Ozone System
Automated Ozone Purification
The EOS O3 system uses ozone gas to help break down contaminants and organic material in the water.
Ozone acts as a powerful oxidizer, reducing the amount of sanitizer needed to maintain clean water. Because the system operates automatically within the spa’s circulation system, it quietly supports water purification in the background.
Many owners choose EOS O3 when they want a more automated approach to water care with minimal chemical demand.
FROG® @ease Mineral System
Self-Regulating Mineral Water Care
The FROG® @ease system combines mineral filtration with SmartChlor® technology that automatically maintains chlorine levels in the spa.
A mineral cartridge releases natural minerals that help control bacteria, while the SmartChlor cartridge adjusts sanitizer levels as the water’s needs change. Because the system self-regulates, spa owners typically only need to replace cartridges periodically and shock the water about once per month.
The result is water that often feels softer and requires fewer weekly adjustments than traditional chlorine systems.
Often chosen by owners who want:
• mineral-enhanced spa water
• reduced chlorine levels (up to 75% less than traditional systems)
• a simple maintenance routine with minimal balancing
How Do Saltwater Hot Tubs Compare?
Saltwater hot tubs use a salt cell to generate chlorine from dissolved salt.
While the experience can feel similar to saltwater pools, these systems still rely on chlorine for sanitation and require periodic salt level monitoring and salt cell maintenance.
For this reason, many modern spas—including Bullfrog—focus on ozone purification and mineral systems that simplify maintenance while avoiding salt-related component wear.
If you’re exploring saltwater specifically, this guide explains the differences in more detail:
Salt Water Hot Tubs: What Maine Spa Buyers Should Know →
Choosing the Right Water Care System
Each of these systems keeps spa water clean and safe. The best choice usually depends on how automated you want the maintenance process to be.
Many owners choose based on simple preferences:
Clear System
Great if you want the most straightforward, familiar approach.
EOS O3 System
Ideal if you prefer automation and minimal chemical use.
FROG @ease System
A popular balance of mineral water feel and simplified maintenance.
In practice, all three systems are designed to keep water care easy so you can focus on enjoying your spa.
Still Exploring Spa Ownership?
If you’re still comparing options, these guides can help you narrow down the right spa for your home:
• Bullfrog Spa Size Guide
• Bullfrog Series Comparison Guide
• JetPak Therapy System Guide
• Low-Maintenance Spa Water Care
Or visit our showroom serving homeowners across Southern Maine and New Hampshire if you’d like to see Bullfrog Spas in person.
