HTH Spa pH Up Spa pH Increaser 2 lb — Mineral-Crystal Formula, Gentle Dissolving for Chlorine & Bromine Spas

HTH Spa pH Up is a 2 lb mineral-crystal formula designed to raise and stabilize your hot tub or spa pH so sanitizers work properly and water stays comfortable. Keeping spa water within the ideal pH window is the simplest way to protect equipment, preserve water clarity, and make each soak more pleasant. HTH Spa pH Up uses mineral crystals that dissolve to gently increase pH without harsh, gritty residues. It works safely with common spa sanitizers including chlorine, bromine and biguanide systems, and pairs with routine testing to maintain a healthy balance between 7.2 and 7.8.

How quickly will HTH Spa pH Up adjust my hot tub's pH?

The product dissolves and begins to raise pH shortly after application, but actual time depends on water temperature and circulation. For most systems, allow 30–60 minutes of pump run time and retest before adding more. Always add in small increments and wait between treatments to avoid overshooting target levels.

• Add with pumps running for faster distribution
• Retest after 30–60 minutes
• Adjust gradually to reach 7.2–7.8 pH range

Will this product harm my spa surfaces or equipment?

When used as directed, HTH Spa pH Up protects metal components and surface finishes by correcting low, corrosive pH. Raising pH to the recommended range reduces the risk of metal corrosion and prolongs the life of heaters, jets, and fittings. Avoid pouring undiluted crystals directly onto surfaces to prevent localized deposits.

• Prevents corrosive conditions from low pH
• Compatible with common spa materials and equipment
• Distribute evenly by adding to circulating water

How do I measure and dose HTH Spa pH Up safely?

Start by testing your spa water with reliable test strips or a test kit to determine the current pH. Add small amounts of pH Up according to the test results and the spa's volume, allow circulation, then retest. For consistent results, check pH twice weekly and keep a maintenance log to track dosing patterns and water chemistry trends.

• Test pH twice weekly with HTH Spa Test Strips
• Add small, measured doses, then circulate and retest
• Record results to refine future dosing needs

Is this product compatible with my sanitizer (chlorine, bromine, biguanide)?

Yes—HTH Spa pH Up is formulated to work with chlorine, bromine, and biguanide systems, helping sanitizers remain effective by keeping pH in the correct zone. Balanced pH improves sanitizer activity and helps avoid irritation or reduced disinfectant performance. Continue routine sanitizer monitoring alongside pH management for best results.

• Safe for chlorine, bromine, and biguanide spas
• Improves sanitizer efficiency by optimizing pH
• Use together with regular sanitizer testing

Who is this for? This 2 lb container of HTH Spa pH Up is made for spa owners who want a straightforward way to correct low pH and maintain water chemistry without complicated procedures. It's ideal for weekend hot tub owners, rental property operators, or anyone who prefers proactive, easy-to-follow maintenance. Pair it with HTH Spa Test Strips and your regular sanitizer routine to keep water clear, equipment protected, and soak sessions comfortable and worry-free.

FAQ

Q: How often should I test and use HTH Spa pH Up?

A: Test pH twice weekly and add pH Up in small increments until pH reaches 7.2–7.8, retesting after each dose.

Q: Can I use HTH Spa pH Up with bromine or biguanide?

A: Yes, HTH Spa pH Up is compatible with chlorine, bromine, and biguanide sanitation systems.