Γ

Skip to the content

Masterspapartsonline

Search by part number or product

Call 1-888-946-8882

Country/region

Australia (USD $)
Austria (USD $)
Belgium (USD $)
Canada (USD $)
Czechia (USD $)
Denmark (USD $)
Finland (USD $)
France (USD $)
Germany (USD $)
Hong Kong SAR (USD $)
Ireland (USD $)
Israel (USD $)
Italy (USD $)
Japan (USD $)
Malaysia (USD $)
Netherlands (USD $)
New Zealand (USD $)
Norway (USD $)
Poland (USD $)
Portugal (USD $)
Singapore (USD $)
South Korea (USD $)
Spain (USD $)
Sweden (USD $)
Switzerland (USD $)
United Arab Emirates (USD $)
United Kingdom (USD $)
United States (USD $)

Filters
Covers
Parts & Equipment
Chemicals
Accessories
Help & Advice

Call 1-888-946-8882Monday – Friday: 9:00AM – 5:00PM

Need help?

Call 1-888-946-8882

Country/region

Australia (USD $)
Austria (USD $)
Belgium (USD $)
Canada (USD $)
Czechia (USD $)
Denmark (USD $)
Finland (USD $)
France (USD $)
Germany (USD $)
Hong Kong SAR (USD $)
Ireland (USD $)
Israel (USD $)
Italy (USD $)
Japan (USD $)
Malaysia (USD $)
Netherlands (USD $)
New Zealand (USD $)
Norway (USD $)
Poland (USD $)
Portugal (USD $)
Singapore (USD $)
South Korea (USD $)
Spain (USD $)
Sweden (USD $)
Switzerland (USD $)
United Arab Emirates (USD $)
United Kingdom (USD $)
United States (USD $)

Filters

Shop filters by spa series Shop all filters
Hot Tub Filters
2025-2026 Master Spa Filters Clarity Spa Filters Contractor Series Filters Down East Spa Filters Getaway Hot Tubs Healthy Living Spa Filters Legacy Whirlpool Filters LH Spa Filters Michael Phelps Legend Series Filters Twilight Series Spa Filters Eco Pur Filters Cold Tub Filters

Swim Spa Filters
Michael Phelps Swim Spa Filters H2X Swim Spa Filters Challenger Swim Spa Filters Trainer Swim Spa Filters Therapool Swim Spa Filters

Filter Parts Weirs & Skimmers Filter Housings & Parts Filter Lids
Not sure which filter?
Our filter guide matches your spa to the right filter set.
Use the filter guide
Subscribe & Save up to 10%Filters delivered every 6 or 12 months
Best sellers Eco Pur Charge Filter PMA-EPR $64.85 Twilight, Legend, Therapool (PMA-40L-F2M, PMA-R1, PMA-EPR) Filter Set $189.99 Clarity, Healthy Living, Therapool (PMA-R3 & PMA-EPR) Filter Set $107.35 H2X & Michael Phelps Swim Spas (2) PWW50P3, (1) PMA-R4, (1) PMA-EPR Filter Set $249.00
Covers
Shop covers by typeAll covers

Hot Tub Covers Swim Spa Covers Axis Roll Up Covers Build a Custom Cover
Shop By Brand
Twilight Spas
Clarity Spas
Getaway Spas
MP Legend Spas
Healthy Living Spas
H2X Swim Spas
MP Swim Spas

Cover Lifters
Cover Lifter Parts

Cover Parts
Cover Locks & Clips
Best sellers 7' x 7' - Hot Tub Cover for Master Spas - 84" x 84" From $675.00 8' x 8' - Hot Tub Cover for Master Spas - 94" x 94" From $675.00 15' x 8' Master Spa - Swim Spa Cover (180" x 94") From $1,450.00 12' x 8' Master Spa - Swim Spa Cover (144" x 94") From $1,350.00
Parts & Equipment
Most popular partsAll parts

Pillows & Headrests Topside Controls Control Pad Overlays Jets Diverter Valves Pumps
Electrical & Controls
Topside Controls
Control Packs
Circuit Boards
Ozone & Ozonators

Pumps, Motors, & Heating
All Pumps
1 Speed Pumps
2 Speed Pumps
Circulation Pumps
Heaters
Heating Elements

Jets & Plumbing
Jets
Plumbing
Plumbing Fittings
Hoses
Gaskets
Diverter Valves
Air Controls

Hardware & Trim
Pillows
Topside Overlays
Filter Lids
Hardware

Part Catalog
All Master Spa Parts
No Longer Available Parts

Know your year & model? Use the Part Finder to see only parts that fit your spa
Chemicals
Shop by typeAll chemicals

Sanitizers & Shock Water Clarifiers pH & Alkalinity Test Strips Cleaning Supplies Starter Kits Cold Tub Chemicals
Shop By Brand
Leisure Time Chemicals
HT Chemicals
Frog chemicals
303 Products
Master Clear
Accessories

Shop accessoriesAll accessories

Aromatherapy
Steps
Handrails
Cover Lifters Cover Lifter Parts
Spa Accessories
SoftTread Flooring
Shop by Spa Model

Shop by your spa model

Twilight SeriesFilters Covers Pillows Jets Pumps Controls Overlays Parts Catalog

ClarityFilters Covers Pillows Jets Pumps Controls Overlays

Michael Phelps LegendFilters Covers Pillows Jets Pumps Controls Overlays

Healthy LivingFilters Covers Pillows Jets Pumps Controls Overlays

GetawayFilters Covers Pillows Jets Pumps Overlays

Legacy WhirlpoolFilters Pillows Jets Pumps Controls Overlays

Down EastFilters Covers Pillows Jets Pumps Controls Overlays

LH SeriesFilters Covers Overlays

Contractor SeriesFilters Pillows Jets

H2X Swim SpasFilters Covers Jets Controls Parts SoftTread

Michael Phelps Swim SpasFilters Covers Jets Parts SoftTread

Know your year & model?
The Part Finder shows only the parts that fit your spa.
Open the Part Finder
Not sure which spa you have?Call 1-888-946-8882 and we’ll look it up
Help & Advice
Orders & Support
Contact Us
Customer Care
Shipping & Returns
Owners Manuals

Warranties
Master Spa Warranties
MSPO Warranties
Cover Warranty

Expert Advice
FAQ's
How-To Guides
Error Codes
Spa Terminology
Filter Guide
Water Test

Subscriptions & Rewards
Subscribe & Save
Manage Subscription
Rewards

For Professionals
Service Professionals
Call 1-888-946-8882Monday – Friday: 9:00AM – 5:00PM

Home » Leisure Time - Calcium Booster 1 lb

Skip to product information

Leisure Time Calcium Booster bottle on a white background

products leisure time calcium booster 1 lb html

products leisure time calcium booster 1 lb html

products leisure time calcium booster 1 lb html

Leisure Time Calcium Booster bottle on a white background

products leisure time calcium booster 1 lb html

products leisure time calcium booster 1 lb html

products leisure time calcium booster 1 lb html

Leisure Time Calcium Booster bottle on a white background

products leisure time calcium booster 1 lb html

products leisure time calcium booster 1 lb html

products leisure time calcium booster 1 lb html

Leisure Time

Leisure Time - Calcium Booster 1 lb

In stock

SKU: 22330

Regular price $11.99

Quantity

This item is a deferred, subscription, or recurring purchase. By continuing, I agree to the cancellation policy and authorize you to charge my payment method at the prices, frequency and dates listed on this page until my order is fulfilled or I cancel, if permitted.

Need Help? Ask an expert

Email 888-946-8882 Chat

Leisure Time - Calcium Booster 1 lb

Raise the level of water hardness, which helps prevent foaming and corrosion of equipment to extend the life of your spa.

Properly balanced spa water should maintain a hardness level of 200-400 ppm.
Compatible with chlorine, bromine, ozone and biguanide sanitizers.

Warranty

Most parts come standard with a 1-Year manufacture warranty

Returns

Hassle-free return process for up to 60 days. Spa covers are final sale and can't be returned.

Same Day Shipping

Order before 3:00pm EST for Same Day Shipping

Free Shipping Over $99

Most items over $99 ship for free to the contiguous U.S

Hot Water News

Subscribe to our newsletter and receive special offers

Your email

Follow us for spa repair tips, how-to videos & maintenance guides

Relax. We are here to help.

Monday - Friday: 9:00AM - 5:00PM

Saturday: 10:00AM - 5:00PM

Sunday: 11:00AM - 4:00PM

Eastern Standard Time (EST)

CUSTOMER CARE

Contact Us
Shipping & Returns
Subscribe & Save
Manage Subscription
Service Professionals
Privacy Policy

RESOURCES

How-To Guides
Error Codes
Owners Manuals
Master Spa Warranties
MSPO Warranties
Rewards
About Us
Reviews

ABOUT MSPO

Master Spa Parts Online offers genuine OEM Master Spa parts, ensuring top-quality replacements for your Master Spa unit. With a full inventory of parts and a team of highly trained representatives, we make maintaining and owning a Master Spa simple and hassle-free.

Master Spa Parts Online, Inc. is an independent business entity and is not an agent or affiliate of Master Spas, Inc. Master Spa is a registered trademark of Master Spas, Inc.

© 2026, Masterspapartsonline - Powered by Shopify

Payment methods

Your cart

Your cart is empty

PART FINDER

Search