Alkalinity Increaser
Total alkalinity helps stabilize pH in spa water. Learn why alkalinity increaser is used and when it matters.
Spa Care Blog
Guides for choosing a spa, equipment, pumps, filters, maintaining hot tub water, testing, balancing, and understanding each chemical. Use these articles with the free Spa Chemical Calculator.
Borates for Hot Tubs
Borates can improve water feel, help buffer pH drift, and reduce some maintenance friction when used correctly.
Bromine for Spas
Bromine is a common hot tub sanitizer that works well in warm water and can be gentler-smelling for some owners.
Calcium Hardness Increaser
Calcium hardness increaser raises dissolved calcium to help prevent aggressive water and protect spa surfaces and equipment.
Calcium Hardness and Saturation Index for Spas
Learn why calcium hardness and saturation index matter in hot tubs, and how balanced water helps reduce corrosion, scale, and cloudy water.
Chlorine for Spas
Chlorine sanitizes hot tub water by killing bacteria and oxidizing organic waste. Learn why it is needed and how to manage it safely.
Complete Spa Maintenance Guide
A complete guide to routine spa maintenance, including testing, sanitizer, pH, alkalinity, filter cleaning, draining, refilling, and troubleshooting.
Cyanuric Acid Stabilizer
Cyanuric acid stabilizer protects chlorine from sunlight, but too much can reduce chlorine effectiveness.
Hot Tub Water Chemistry: The Beginner’s Guide
Learn the core hot tub water chemistry readings every spa owner should understand, including sanitizer, pH, alkalinity, calcium hardness, and water balance.
How to Balance Spa Water Step by Step
A step-by-step process for balancing hot tub water after a refill or when readings are out of range.
How to Choose a Spa or Hot Tub
A practical buyer’s guide to choosing the right spa size, shell, insulation, jet layout, electrical setup, and maintenance system before you buy.
How to Test Spa Water Correctly
Learn how to test hot tub water with strips or liquid kits, when to test, which readings matter most, and how to avoid bad readings.
Metal and Scale Control
Metal sequestrants and scale control products help manage source-water metals, hardness, and deposits in some spas.
Salt for Saltwater Spas
Salt is used by salt chlorine generator systems to produce sanitizer, but salt level must stay within the equipment range.
What Should Chlorine Be in a Hot Tub?
Understand normal spa chlorine levels, why hot tubs need more sanitizer than pools, and how to respond when free chlorine is too low or too high.
Spa Equipment Guide: What Every Hot Tub Owner Should Know
Learn the major parts of a spa system, including pumps, filters, heaters, jets, controls, covers, plumbing, and sanitation equipment.
Spa Filters Explained: Cleaning, Replacing, and Choosing Cartridges
Learn how spa filters work, how often to rinse and deep clean them, when to replace cartridges, and why filtration matters for hot tub water chemistry.
Spa pH and Alkalinity: How to Balance Them
A practical guide to balancing spa pH and total alkalinity without chasing numbers or overcorrecting your hot tub water.
pH Increaser and pH Decreaser
pH chemicals adjust spa water acidity so sanitizer works properly and the water feels comfortable.
Spa Pumps Explained: Circulation Pumps vs Jet Pumps
Learn what spa pumps do, the difference between circulation pumps and jet pumps, and how pump flow affects heating, filtration, and water clarity.
Spa Shock and Oxidizer
Spa shock or oxidizer helps break down contaminants, refresh sanitizer performance, and clear used-up waste after soaking.
Simple Weekly Hot Tub Maintenance Schedule
Use this simple weekly spa maintenance schedule to keep sanitizer, pH, alkalinity, filters, and water clarity under control.