Top 10 Hardness Increaser Hot Tub – Swimming Pool Balancers

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32 fl oz, Leisure Time CB Calcium Booster Balancer for Spas and Hot Tubs

LEISURE TIME #ad - Features: prevents corrosion and foam; Part of Leisure Time's Simple Spa Care program. Includes: one 32-oz bottle of Leisure Time Calcium Booster. Use: one ounce increases hardness 7 ppm in 500 gallons of water. Prevents corrosion. Compatibility: Compatible with chlorine, ozone, bromine, and biguanide sanitizers. Compatible with chlorine, bromine, ozone and biguanide sanitizers. Benefits: raises water hardness to maintain a level of hardness between 150-400 ppm. One ounce increases hardness 7 ppm in 500 gallons of water.
ManufacturerLeisure Time #ad
Height9.5 Inches
Length3.12 Inches
Weight2.58 Pounds
Width3.12 Inches
Part NumberCB

2. PureSpa


SpaPure Calcium Hardness Increaser 16oz

PureSpa #ad - Compatible with all systems including bromine, chlorine, mineral sanitizers, and biguanide. Stop and prevent the corrosion of your spa's surfaces. Safely raise the calcium hardness levels in your spa water.
BrandPureSpa #ad
ManufacturerHaviland #ad
Part NumberSPA2729CS20B6

3. SpaGuard


SpaGuard Spa Calcium Hardness Increaser 12 oz 3 Pack

SpaGuard #ad - Spaguard calcium hardness Increaser 12oz - 3 Pack. Granula Calcium Chloride. Prevents corrosion of equipment and etching of plaster due to low calcium levels.
BrandSpaGuard #ad
ManufacturerSpaGuard #ad
Weight2.5 Pounds
Part Number42258BIOx3

4. Clorox


Clorox Pool&Spa 12204CLX Calcium Hardness Increaser, White, 4 lb

Clorox #ad - Power source Type: Manual. Prevents corrosion, etching, and staining. Prevents pool surface damage. Increases low Total Hardness levels in swimming pool water. Ideal for plaster pools and soft water areas. For best results, use with the Clorox Pool app.
BrandClorox #ad
ManufacturerClorox® Pool&Spa™ #ad
Height11.5 Inches
Length4.4 Inches
Weight4 Pounds
Width10 Inches
Part Number12204CLX

5. Spa Essentials


12-Ounce, Spa Essentials 32534000 Calcium Hardness Increaser Granules for Spas and Hot Tubs

Spa Essentials #ad - Helps prevent corrosion Of Spa Equipment And Surfaces. No assembly Required. Easy to Use. Increases calcium Hardness Level In Spa Water.
BrandSpa Essentials #ad
ManufacturerRobelle Industries #ad
Height8 Inches
Length3 Inches
Weight0.75 Pounds
Width3 Inches
Part Number32534000
WarrantyReturns are not accepted on opened or used products and are subject to a 20% restocking fee

6. SpaGuard


SpaGuard Spa Calcium Hardness Increaser, 12 Ounce

SpaGuard #ad - Per 100 gallons raises calcium hardness 25ppm. Prevents corrosion of equipment due to low calcium hardness. 1 tbs. Prevents etching of plaster due to low calcium hardness.
BrandSpaGuard #ad
ManufacturerBioguard #ad
Weight0.75 Pounds
Part Number42257BIO
WarrantyReturns are not accepted on opened or used items and are subject to a 20% restocking fee.



32 Fluid Ounce Bottle 2 Pack, LEISURE TIME Calcium Booster Balancer Spa and Hot Tub Water Hardness and Foam Preventive Care

LEISURE TIME #ad - Prevents foam and hard water: Aids in preventing foam and corrosion of equipment. Calcium booster: Boosts calcium in spa and hot tub water. Easy-to-use: easy-to-use, 1-ounce increases hardness 7 ppm in 500 gallons of water. Proper levels: proper water hardness level should be between 150-400 ppm. Compatible with: Compatible with chlorine, ozone, bromine, and biguanide sanitizer systems.
ManufacturerLeisure Time #ad
Height0 Inches
Length0 Inches
Weight52 Pounds
Width0 Inches
Part Number2xCB

8. MAV AquaDoc


Spa Calcium Increaser & Hot Tub water hardener Spa Chemicals, Calcium Increaser Spa Hardness Increaser & Calcium Booster for Hot Tubs, AquaDoc | Spa Calcium Hardness Increaser Hot Tub Owners Rely on

MAV AquaDoc #ad - Our spa calcium hardness increaser is vital to ensuring proper water hardness levels in your hot tub. 4 run filter for 1 - 2 hours, wait 20 minutes, Made in the USA - 1 Check your calcium levels, then retest water. The hardness increaser hot tub owners love - when it comes to Spa Chemicals calcium hardness increaser is a must have.

Avoid corrosion, etching, and staining - aquadoc's professional Grade Hot Tub Calcium increaser is your best defense against soft water in your hot tub or spa. Guard calcium levels from decreasing too low with our spa Calcium booster for hot tubs. How it works - aquadoc's hot tub calcium hardness increaser works to raise your water's hardness level to ensure properly balanced hot tub water. Our spa hardness increaser easily works to raise your Calcium levels by 10ppm increments or more.

Easy to use, 2 1 ounce of aquadoc's calcium increaser will boost water's hardness level by 10ppm. Always have a hot tub calcium booster ready and waiting. 3 after determining hardness level goal, add proper amount of increaser while equipment is on. Without hot tub chemicals calcium hardness can become unbalanced. Aquadoc's calcium Booster gets your hardness up. Make balancing your water easier & more cost effective with AquaDoc's calcium hardness increaser.
BrandMAV AquaDoc #ad
Weight0.06 Pounds

9. Baqua Spa


14 oz, Baqua Spa 88825 Calcium Hardness Increaser Spa and Hot Tub Balancer

Baqua Spa #ad - Includes: one 14-oz container of BAQUA Spa Calcium Hardness Increaser. Compatibility: Works with all biguanide sanitizer systems. Features: Bromine and chlorine free. Benefits: raises spa water to the recommended level of calcium hardness. Use: part of baqua spa's bromine-free and chlorine-free maintenance product line.
BrandBaqua Spa #ad
ManufacturerInnovative Water Care #ad
Height2.44 Inches
Length2.44 Inches
Weight0.88 Pounds
Width6.2 Inches
Part Number88825

10. Quality Producer Direct


Calcium Hardness Increaser 1 Gallon Calcium Chloride Powder for Pools & Hot Tubs

Quality Producer Direct #ad - Manufactured in the USA. Calcium chloride anhydrous Powder Increases Total Hardness of Pool Water. Used to prevent Corrosion in Pools & Hot Tubs. Great value: 1 gallon of Calcium Chloride Powder. Lab-tested & Certified.
BrandQuality Producer Direct #ad
ManufacturerQuality Producer Direct #ad
Height7.5 Inches
Length7.47 Inches
Width7.47 Inches