SPA FROG® In-Line System

Out of Sight AND Out of Mind

SPA FROG<sup>®</sup> In-Line System

Rating: 5 from 5 ratings

A select group of hot tub manufacturers have built the SPA FROG Fresh Mineral Water hot tub system into their hot tubs, up to 600 gallons, making caring for your water even easier. The SPA FROG In-Line Fresh Mineral Water® system offers water care that is built directly into your hot tub, adding even more elegance to an already luxurious experience. FROG Fresh Mineral Water hot tub care is extremely effective while providing softer, crystal clear water for your enjoyment.


  • Fresh Mineral Water System for Hot Tubs up to 600 gallons
  • Pre-filled cartridges for no mess, no guess and no stress water care
  • Kills bacteria with up to 50% less bromine*
  • The Mineral Cartridge lasts 4 months or whenever you drain your hot tub
  • Special larger sized Bromine Cartridges lasts 3-4 weeks depending on hot tub usage
  • Use with FROG Jump Start® for an effective start-up shock when refilling the tub
  • Easy to use with weeks of consistent and effective water sanitization
  • The Bromine Cartridges are recyclable when empty

How It Works

The SPA FROG Fresh Mineral Water In-Line System is part of the hot tub's plumbing, with an easily distinguishable and convenient cap for top loading of the mineral and bromine cartridges. A simple twist and the cartridge basket is removed from the hot tub for quick and easy cartridge replacement. The entire process takes less than a minute. The minerals last a full four months set wide open, while the bromine usually lasts around three weeks with adjustable settings to meet each hot tub’s needs.


Water Balancing is vital for any sanitizer to work effectively, see our easy guide.

SPA FROG<sup>®</sup> In-Line System
SPA FROG<sup>®</sup> In-Line System
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Spa Minerals versus standard chlor/bromine


The ultimate in hot tub water care. No daily or weekly dosing. No expensive maintenance as with UV or Ozone, and none of the corrosive drawbacks found in salt systems. For consumers who like to “set it and forget it," SPA FROG is the answer.

Spa Minerals versus standard chlor/bromine
FROG<sup>®</sup> Jump Start<sup>®</sup>

FROG® Jump Start®

Easy spa start up that removes contaminants and sets the residual.Learn More
FROG<sup>®</sup> Test Strips

FROG® Test Strips

Precisely reads the low chlorine levels used with FROG minerals.Learn More

7 thoughts on “SPA FROG® In-Line System

  1. Phil Johnson
    Rating: 5

    The in line system works great I’ve had our Calder hot tub for 14months. The only prob I’ve had was the cartridge holder is falling apart because of the chemicals. Need to order one. I give your system 5 stars.

  2. David

    This product is absolutely the best solution to your hot tub enjoyment! I have a Marquis spa and with the in-line system there is nothing floating in the water. There is no chemical odor, relatively no maintenance and most importantly, clean, FRESH water. Very, very, impressed!

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