Top 7 Spa Guard Calcium Hardness Increaser for Hot Tub – Kitchen & Dining Features

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1. SpaGuard


12 Ounce, SpaGuard Spa Calcium Hardness Increaser

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

2. MAV AquaDoc


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

MAV AquaDoc #ad - Without hot tub chemicals calcium hardness can become unbalanced. Our spa hardness increaser easily works to raise your Calcium levels by 10ppm increments or more. Aquadoc's calcium Booster gets your hardness up. Guard calcium levels from decreasing too low with our spa Calcium booster for hot tubs.

Our spa calcium hardness increaser is vital to ensuring proper water hardness levels in your hot tub. 4 run filter for 1 - 2 hours, then retest water. The hardness increaser hot tub owners love - when it comes to Spa Chemicals calcium hardness increaser is a must have. Make balancing your water easier & more cost effective with AquaDoc's calcium hardness increaser. Easy to use, wait 20 minutes, 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, Made in the USA - 1 Check your calcium levels, add proper amount of increaser while equipment is on. 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. 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.
BrandMAV AquaDoc #ad



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

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

4. Spa Essentials


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

Spa Essentials #ad - No assembly Required. Easy to Use. Helps prevent corrosion Of Spa Equipment And Surfaces. 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

5. PureSpa


SpaPure Calcium Hardness Increaser 16oz

PureSpa #ad - Protect your spa equipment and bather comfort. Ensure water won't become corrosive. Fast acting liquid calcium hardness balancer.
BrandPureSpa #ad
ManufacturerHaviland #ad
Part NumberSPA2729CS20B6

6. Baqua Spa


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

Baqua Spa #ad - Features: Bromine and chlorine free. Compatibility: Works with all biguanide sanitizer systems. Benefits: raises spa water to the recommended level of calcium hardness. Includes: one 14-oz container of BAQUA Spa Calcium Hardness Increaser. 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
Weight1 Pounds
Width6.2 Inches
Part Number88825

7. Clorox


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

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