Saltwater Hot Tub Startup: First Week Checklist: Daily Spa Care Notes
Set up a saltwater spa with a careful first-week checklist for salt level, sanitizer, pH, alkalinity, calcium, output, and testing.
Spa Care Blog
Guides for choosing a spa, maintaining hot tub water, testing, balancing, filters, pumps, and chemical education. Use these articles with the free Spa Chemical Calculator or download the Android app.
Hot Tub Calcium Hardness: Low, High, and Just Right: Daily Spa Care Notes
Understand spa calcium hardness, why low hardness can be aggressive, why high hardness can scale, and how to adjust carefully.
Hot Tub Alkalinity Too Low: Signs and Safe Correction: Daily Spa Care Notes
Learn the signs of low spa alkalinity, why pH becomes unstable, and how to raise total alkalinity without overshooting.
Hot Tub pH Keeps Rising: Why It Happens: Daily Spa Care Notes
A practical guide to rising spa pH, aeration, alkalinity, jets, salt systems, acid dosing, and how to stop chasing pH every day.
Foamy Hot Tub Water: Causes, Fixes, and Prevention: Daily Spa Care Notes
Find out why hot tub water gets foamy and how to fix detergents, oils, low calcium, filters, sanitizer demand, and old water.
How Much Shock to Add to a Hot Tub After Heavy Use: Daily Spa Care Notes
Use this guide to understand hot tub shock after parties, family soaks, cloudy water, and high combined chlorine without overdosing a small spa.
Bromine vs Chlorine for Hot Tubs: Practical Owner Guide: Daily Spa Care Notes
Compare bromine and chlorine for spa water, including hot-water performance, odor, dosing style, testing, shocking, and when each sanitizer makes sense.
Hot Tub Chlorine Drops Overnight: What to Check First: Daily Spa Care Notes
Learn why spa chlorine disappears overnight and how to check sanitizer demand, pH, filters, bather load, and dosing before adding more chemicals.
Hot Tub Test Strips vs Drop Kits: Which Should You Use?
Compare spa test strips and liquid drop kits for speed, accuracy, sanitizer, pH, alkalinity, calcium, and salt readings.
Hot Tub Filter Cleaning Schedule for Clearer Water
Build a simple spa filter cleaning schedule for weekly rinsing, monthly deep cleaning, cartridge replacement, and water clarity.
When to Drain and Refill a Hot Tub Instead of Adding More Chemicals
Know when a hot tub needs fresh water instead of more chemicals, including TDS, foaming, odor, sanitizer demand, and refill timing.
Saltwater Hot Tub Startup: First Week Checklist
Set up a saltwater spa with a careful first-week checklist for salt level, sanitizer, pH, alkalinity, calcium, output, and testing.
Hot Tub Calcium Hardness: Low, High, and Just Right
Understand spa calcium hardness, why low hardness can be aggressive, why high hardness can scale, and how to adjust carefully.
Hot Tub Alkalinity Too Low: Signs and Safe Correction
Learn the signs of low spa alkalinity, why pH becomes unstable, and how to raise total alkalinity without overshooting.
Hot Tub pH Keeps Rising: Why It Happens
A practical guide to rising spa pH, aeration, alkalinity, jets, salt systems, acid dosing, and how to stop chasing pH every day.
Foamy Hot Tub Water: Causes, Fixes, and Prevention
Find out why hot tub water gets foamy and how to fix detergents, oils, low calcium, filters, sanitizer demand, and old water.
How Much Shock to Add to a Hot Tub After Heavy Use
Use this guide to understand hot tub shock after parties, family soaks, cloudy water, and high combined chlorine without overdosing a small spa.
Bromine vs Chlorine for Hot Tubs: Practical Owner Guide
Compare bromine and chlorine for spa water, including hot-water performance, odor, dosing style, testing, shocking, and when each sanitizer makes sense.
Hot Tub Chlorine Drops Overnight: What to Check First
Learn why spa chlorine disappears overnight and how to check sanitizer demand, pH, filters, bather load, and dosing before adding more chemicals.
pH Increaser and pH Decreaser
pH chemicals adjust spa water acidity so sanitizer works properly and the water feels comfortable.
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 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.
Spa Shock and Oxidizer
Spa shock or oxidizer helps break down contaminants, refresh sanitizer performance, and clear used-up waste after soaking.
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 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 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.
Simple Weekly Hot Tub Maintenance Schedule
Use this simple weekly spa maintenance schedule to keep sanitizer, pH, alkalinity, filters, and water clarity under control.
Salt for Saltwater Spas
Salt is used by salt chlorine generator systems to produce sanitizer, but salt level must stay within the equipment range.
Metal and Scale Control
Metal sequestrants and scale control products help manage source-water metals, hardness, and deposits in some spas.
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.
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 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.
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.
Cyanuric Acid Stabilizer
Cyanuric acid stabilizer protects chlorine from sunlight, but too much can reduce chlorine effectiveness.
Complete Spa Maintenance Guide
A complete guide to routine spa maintenance, including testing, sanitizer, pH, alkalinity, filter cleaning, draining, refilling, and troubleshooting.
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.
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.
Calcium Hardness Increaser
Calcium hardness increaser raises dissolved calcium to help prevent aggressive water and protect spa surfaces and equipment.
Bromine for Spas
Bromine is a common hot tub sanitizer that works well in warm water and can be gentler-smelling for some owners.
Borates for Hot Tubs
Borates can improve water feel, help buffer pH drift, and reduce some maintenance friction when used correctly.
Alkalinity Increaser
Total alkalinity helps stabilize pH in spa water. Learn why alkalinity increaser is used and when it matters.