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Very Important!

 

Before using car-

tridges, establish an initial residual of 
0.5 - 1.0 ppm free chlorine with FROG

®

 

Jump Start

®

 (EPA Reg. No.: 53735-12) 

start-up shock, included in this package, 

that quickly dissolves with an effervescent fizzing action – one 
packet per 500 gallons. 

4.

FOR SPAS AND HOT TUBS

® 

Step 1: Prepare the Hot Tub

• Check water balance. pH and 
Total Alkalinity need to be in the 
proper ranges for the SPA FROG 
In-Line System to work correctly.

• Check SPA FROG Bromine 
cartridge and replace if empty—
see instructions under “Put the 
System to Work”.

• Check your calendar. The SPA 
FROG mineral cartridge needs to 
be replaced every four months. 

• Remove the SPA FROG Bromine 
Cartridge from the In-Line System 
until the bromine level is down to 
2.0 ppm.

• Lower the Bromine Cartridge 
setting by 1 number and replace 
cartridge in the In-Line System.

• Test in 24 hours. Repeat process 
until bromine level stays within 1.0 
to 2.0 ppm.

Step 2: Set the Cartridges

Step 3: Put the System to Work

Step 4: Routine Hot Tub Care

Troubleshooting

Manufactured by: King Technology, Inc. 

530 11th Ave S, Hopkins, MN 55343 U.S.A.  
952-933-6118 • Customer Service 800-222-0169 
FAX 952-933-2206  www.FrogProducts.com

SPA FROG

®

In-Line System 

Operating Instructions 

• Cloudy Water or Low-Bromine Levels

• High Bromine Levels

Made in U.S.A.   Patents: www.KingTechnology.com/IP    
EPA Est. No.: 071209-AZ-001            E092816553101643R3N         20-48-0169

Remove holder by pushing down
and turning counter clockwise 
before pulling out.

Replace blue Mineral Cartridge every four months.

•  Discard it in the trash even if it appears to have media left inside.
•  Don’t  attempt to reuse: the minerals are spent after 4 months.

Replace green Bromine Cartridge when empty.

•  Life of cartridge varies depending on hot tub size and number 
  of users.
•  Drain water from cartridge to ensure it is empty.
•  Discard in trash or recycle. 

Set the blue Mineral Cartridge

 to #6 

(hold the bottom and turn the top until 
6 appears in the window). No further 
adjustments are necessary for the life of 
the cartridge.

The In-Line System is made up of: 

(A) a cap

 that is easily distinguish-

able among the fittings on the top 
of the hot tub 

(B) a cartridge holder

 that pulls out 

of the system

(C) a SPA FROG Mineral Cartridge

 

that helps control bacteria in the 
water 

(D) a SPA FROG Bromine Cartridge

 

that helps support the minerals 
while oxidizing contaminants like 
body oils and ammonia compounds 
responsible for smelly chloramines. 
The cartridges are adjustable to 
meet your specific hot tub water 
care needs.

C. 

SPA FROG

Mineral 

Cartridge

Water

Flow

A.

  Cap

B. 

Cartridge 

Holder

D.

 

SPA FROG

Bromine

Cartridge

3.

Heat water to the manufacturer’s recommended 
temperature.

5.
6.

Begin routine hot tub care (see Step 4: Routine Hot 
Tub Care) as soon as hot tub is prepared.

  

Water Balance Guidelines

pH: 

7.2 – 7.8

Total Alkalinity: 

80 - 120 ppm

Calcium Hardness: 

150 - 250 ppm

Total Dissolved Solids:   <1500

IMPORTANT:

  Always follow printed instructions on the balancing 

chemical packages. Add balancing chemicals in small increments one at a 
time with the jets on and wait 6 hours before testing again and adding any 
additional balancing chemicals.

b.

 Look at the 

Total Alkalinity

 reading first. Adjustments 

should be made to bring the Total Alkalinity in the 

range of 

80 – 120 ppm

 prior to making any adjustments to pH even if 

it throws pH off further.

a.

 

Take a water sample from the hot 

tub and dip a FROG

®

 Test Strip into it.

Balance water by following STePS

 

a — d

 

in order.

 

c.

 

After Total Alkalinity is in range, 

test for pH

. It should be 

between 7.2 and 7.8.

 If higher or lower, add a pH adjuster.

 

d. 

Lastly 

test for Calcium Hardness.

 It should be 

between 

150 and 250 ppm

. If higher, partially drain the hot tub (about 6 inch-

es) and fill with water low in calcium. If lower, add Calcium Increaser. 

If balancing takes longer than 2 days, shock the water and 
maintain a chlorine level while continuing balancing.

Fill hot tub with fresh water.

 

Metal 

Out

If using source water that is high in 

iron or other metals, see your dealer 

before filling the hot tub. It may 

require the use of a metal control 

product.

Cleaner

 

because it kills bacteria two ways

Clearer

 

because it helps keep pH balanced

Softer

 

because there’s up to 50%* less bromine 

Easier

 

with pre-filled cartridges for no mess, or measuring

Cleaner

 

because it kills bacteria two ways

Clearer

 

because it helps keep pH balanced

Softer

 

because there’s up to 50%* less bromine 

Easier

 

with pre-filled cartridges for no mess, or measuring

Clean or replace filter cartridges.

 

(Follow manufacturer’s instructions).

1.

2.

Slowly insert holder into system (see 
diagrams). Line up holder arrow-

(1)

 

with system arrow-

(2)

Push down until 

holder tabs-

(3)

 go past system tabs-

(4)

 

and turn holder to the right (clockwise) 
until it stops. To ensure a locked 
position, attempt to pull holder up. 
If it stays in place, the lock is secure.

-

System

Arrow

3

-Holder 

     Tab

1

-Holder 

     Arrow

4

-System 

     Tab

Replace
Cap

Snap the SPA FROG Mineral Car-
tridge into the area marked “Miner-
als” (top portion) and the SPA FROG 
Bromine Cartridge into the area 
marked “Bromine or SmartChlor” 
(bottom portion) making sure to 
line up the indentation at the top 
of the cartridges with the raised 
area on the holder.

DO NOT OPEN CAP WHILE JETS 
ARE ON.

3.

4.

5.

1.

Replacing Cartridges

2.

Open cap of In-Line System and 
set aside. 

B RA N D

B RA N D

Lubricate in-line holder o-ring twice a year with a silicone 
lubricant.

Shock the hot tub once a week or as 
needed with a non-chlorine shock. 
Heavily used hot tubs may require 
more frequent shocking.

1.

Drain and refill hot tub as direct-
ed by your hot tub manufacturer 
or every four months when FROG 
minerals need to be replaced.

2.

3.

6.

7.

Run filtration system as the 
manufacturer recommends 
to maintain proper water flow 
through the In-Line System.

Regularly test water with FROG 
Test Strips and follow directions 
in Step 1 for maintaining pH, 
Total Alkalinity and Calcium 
Hardness.  

NOTe:

 pH is affected by bather load, chemicals used, evapo-

ration and the make-up of your source water so maintaining 
water balance regularly is important.

Replace mineral and bromine cartridges 
as directed in Step 3: Put the System to 
Work.

Cut-away view of cartridges 
snapped into holder and 
placed into the In-Line 
System.

Set the green Bromine Cartridge 

to 

the setting that matches your hot 
tub size in gallons.

Register your 

In-Line System at 

FrogProducts.com

Learn more at www.FrogProducts.com or call 800.222.0169

* Compared to the minimum ANSI recommended bromine level of 2.0 in a      

   residential hot tub.

 SPA FROG Mineral 

Cartridge (Blue)

SPA FROG Bromine Cartridge 

(Green)

5.

4.

Maintain at least a 1.0 ppm bromine level at all times.

Note:

 Bromine levels are reduced up to 50%* when 

using FROG minerals.

2

System Setting Chart

200 Gallons

0

250 Gallons

1

300 Gallons

1

350 Gallons

2

400 Gallons

3

450 Gallons

4

500 Gallons

5

550 Gallons

5

600 Gallons

6

B R AND

*Minerals

*Bromine or   SmartChlor

NOTE:

 

Using

the bromine

cartridge in 

the area 

marked

“Minerals” 

can cause over

bromination

which shortens

cartridge life

.

Indent on 
cartridges

Raised
area inside
holder,
one for
each 
cartridge

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