Top 10 Spa Chemicals Calcium Hardness Increaser – Swimming Pool Balancers

As an Amazon Associate I earn from qualifying purchases.

1. Clorox

#ad

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

#ad
Clorox #ad - Ideal for plaster pools and soft water areas. Prevents pool surface damage. Prevents corrosion, etching, and staining. Increases low Total Hardness levels in swimming pool water. For best results, use with the Clorox Pool app. Power source Type: Manual.
BrandClorox #ad
ManufacturerClorox® Pool&Spa™ #ad
Height11.5 Inches
Length4.4 Inches
Weight4 Pounds
Width10 Inches
Part Number12204CLX
Model12204CLX

2. MAV AquaDoc

#ad

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

#ad
MAV AquaDoc #ad - Our spa hardness increaser easily works to raise your Calcium levels by 10ppm increments or more. 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. Always have a hot tub calcium booster ready and waiting.

Our spa calcium hardness increaser is vital to ensuring proper water hardness levels in your hot tub. 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. Aquadoc's calcium Booster gets your hardness up. Guard calcium levels from decreasing too low with our spa Calcium booster for hot tubs. Make balancing your water easier & more cost effective with AquaDoc's calcium hardness increaser.

Easy to use, add proper amount of increaser while equipment is on. The hardness increaser hot tub owners love - when it comes to Spa Chemicals calcium hardness increaser is a must have. 3 after determining hardness level goal, wait 20 minutes, then retest water. 4 run filter for 1 - 2 hours, made in the usa - 1 check your calcium levels, 2 1 ounce of AquaDoc's Calcium increaser will boost water's hardness level by 10ppm. Without hot tub chemicals calcium hardness can become unbalanced.
BrandMAV AquaDoc #ad

3. Baqua Spa

#ad

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

#ad
Baqua Spa #ad - Includes: one 14-oz container of BAQUA Spa Calcium Hardness Increaser. Compatibility: Works with all biguanide sanitizer systems. Use: part of baqua spa's bromine-free and chlorine-free maintenance product line. Benefits: raises spa water to the recommended level of calcium hardness. Features: Bromine and chlorine free.
BrandBaqua Spa #ad
ManufacturerInnovative Water Care #ad
Height2.44 Inches
Length2.44 Inches
Weight1 Pounds
Width6.2 Inches
Part Number88825
Model88825

4. SpaChoice

#ad

2-Pack, Spa Choice 472-3-3061-02 Increase Calcium Spa Chemical, 1-Quart

#ad
SpaChoice #ad - Low hardness will etch plaster and corrode spa equipment. The ideal hardness level is 200-400 ppm parts per million. Spa choice increase calcium is used to increase calcium hardness in spas and hot tubs in areas with low levels of hardness. Downloadable user guide Available Under Product Information: Technical Specifications.
BrandSpaChoice #ad
ManufacturerSpa Choice #ad
Height10 Inches
Length6 Inches
Weight4.5 Pounds
Width3 Inches
Part Number472-3-3061-02
Model472-3-3061-02

5. Spa Essentials

#ad

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

#ad
Spa Essentials #ad - Helps prevent corrosion Of Spa Equipment And Surfaces. Increases calcium Hardness Level In Spa Water. Easy to Use. No assembly Required.
BrandSpa Essentials #ad
ManufacturerRobelle Industries #ad
Height8 Inches
Length3 Inches
Weight0.75 Pounds
Width3 Inches
Part Number32534000
Model32534000
WarrantyReturns are not accepted on opened or used products and are subject to a 20% restocking fee

6. Puri Tech

#ad

Puri Tech Pool Chemicals Calcium Hardness Increaser Plus for Pools & Spas Increases Calcium Hardness Levels 5lb

#ad
Puri Tech #ad - Raises calcium in swimming pool water. Calcium hardness level prevents foaming, equipment and surface erosion and scaling. 10, 25 lbs/200ppm.

Brand new packaging: all puri Tech Chemicals now come in resealable bags for easy storage! Active ingredients: Calcium Chloride. 5, 12. 5 lbs/200ppm. See package for instructions. Dosage: 2, 000 gallons: 6. 25 lbs to increase hardness 50ppm, 6. 25 lbs/200ppm. 20, 12. 5 lbs/100ppm, 25 lbs/100ppm, 000 gallons: 1. 5 lbs to increase hardness 50ppm, 000 Gallons: 3 Lbs to increase hardness 50ppm, 6. 25 lbs/100ppm, 3 lbs/100ppm, 000 Gallons: 105 lbs to increase hardness 50ppm, 50 Lbs/200ppm.
BrandPuri Tech #ad
ManufacturerPuri Tech #ad
Height6 Inches
Length12 Inches
Width6 Inches
Part NumberPCC
ModelPCC

7. SpaGuard

#ad

12 Ounce, SpaGuard Spa Calcium Hardness Increaser

#ad
SpaGuard #ad - Prevents etching of plaster due to low calcium hardness. Prevents corrosion of equipment due to low calcium hardness. 1 tbs. Per 100 gallons raises calcium hardness 25ppm.
BrandSpaGuard #ad
ManufacturerSpaGuard #ad
Weight0.75 Pounds
Part Number42257BIO
ModelBIO42257
WarrantyReturns are not accepted on opened or used items and are subject to a 20% restocking fee.

8. Puri Tech

#ad

Puri Tech Pool Chemicals 50 lb Calcium Hardness Increaser Plus for Swimming Pools & Spas Increases Calcium Hardness Levels Prevents Staining on Surfaces

#ad
Puri Tech #ad - Raises calcium in swimming pool water. Calcium hardness level prevents foaming, equipment and surface erosion and scaling. See package for instructions.

5, 000 gallons: 105 lbs to increase hardness 50ppm, 50 Lbs/200ppm. Dosage: 2, 25 lbs/200ppm. Brand new packaging: all puri Tech Chemicals now come in resealable bags for easy storage! Active ingredients: Calcium Chloride. 10, 12. 5 lbs/100ppm, 3 lbs/100ppm, 6. 25 lbs/200ppm. 20, 000 gallons: 6. 25 lbs to increase hardness 50ppm, 25 lbs/100ppm, 6. 25 lbs/100ppm, 000 gallons: 1. 5 lbs to increase hardness 50ppm, 000 gallons: 3 lbs to increase hardness 50ppm, 12. 5 lbs/200ppm.
BrandPuri Tech #ad
ManufacturerPuri Tech #ad
Height9 Inches
Length19 Inches
Width13 Inches

9. Puri Tech

#ad

Puri Tech Pool Chemicals 10 lb Calcium Hardness Increaser Plus for Swimming Pools & Spas Increases Calcium Hardness Levels Prevents Staining on Surfaces

#ad
Puri Tech #ad - 10, 12. 5 lbs/100ppm, 25 lbs/100ppm, 6. 25 lbs/100ppm, 3 lbs/100ppm, 000 gallons: 3 lbs to increase hardness 50ppm, 6.25 lbs/200ppm.

20, 000 gallons: 1. 5 lbs to increase hardness 50ppm, 000 Gallons: 6. 25 lbs to increase hardness 50ppm, 50 Lbs/200ppm. 5, 000 gallons: 105 lbs to increase hardness 50ppm, 25 Lbs/200ppm. Raises calcium in swimming pool water. Calcium hardness level prevents foaming, equipment and surface erosion and scaling. See package for instructions. Brand new packaging: all puri Tech Chemicals now come in resealable bags for easy storage! Active ingredients: Calcium Chloride. Dosage: 2, 12. 5 lbs/200ppm.
BrandPuri Tech #ad
ManufacturerPuri Tech #ad
Part NumberPCC
ModelPCC

10. Puri Tech

#ad

Puri Tech Pool Chemicals 25 lb Calcium Hardness Increaser Plus for Swimming Pools & Spas Increases Calcium Hardness Levels Prevents Staining on Surfaces

#ad
Puri Tech #ad - Raises calcium in swimming pool water. Calcium hardness level prevents foaming, equipment and surface erosion and scaling. 5, 50 lbs/200ppm.

Brand new packaging: all puri Tech Chemicals now come in resealable bags for easy storage! Active ingredients: Calcium Chloride. See package for instructions. Dosage: 2, 000 gallons: 1. 5 lbs to increase hardness 50ppm, 000 gallons: 6. 25 lbs to increase hardness 50ppm, 000 gallons: 105 lbs to increase hardness 50ppm, 12. 5 lbs/100ppm, 25 lbs/100ppm, 3 lbs/100ppm, 000 gallons: 3 Lbs to increase hardness 50ppm, 25 Lbs/200ppm.20, 12. 5 lbs/200ppm. 10, 6. 25 lbs/100ppm, 6. 25 lbs/200ppm.
BrandPuri Tech #ad
ManufacturerPuri Tech #ad
Part NumberPCC
ModelPCC