HTH Spa Alkalinity Up bottle closeup showing stable water balance
HTH Spa Alkalinity Up being poured into a hot tub to balance alkalinity
HTH Spa Alkalinity Up test strip view promoting stable pH balance
HTH Spa Alkalinity Up instruction label guiding correct dosage for balanced water
HTH Spa Alkalinity Up powder being added into spa water for stabilization
HTH Spa Alkalinity Up-treated water with clear, sparkling surface
HTH Spa Alkalinity Up works with bromine, chlorine, or biguanide for balanced water

HTH

HTH Spa Alkalinity Up – Raise Alkalinity and Stabilize Spa pH (1.25 lb)

High-performance patio lawn and garden made for confident daily results

$13.13

3 shoppers currently have this item in cart.

Low stock: only 5 left in inventory. Add to cart before it's gone.

Shop Pay installment options may appear at checkout where eligible.

Free shipping Secure checkout 100% refund eligible
Bundle & save Buy 2 and save checkout time

Premium patio lawn and garden quality selected for United States (USA) customers.

Routine pack Build your routine pack (3)

Fast dispatch with always-free shipping and secure checkout on every order.

Free shipping

i

Free shipping on every order. Fast dispatch, tracked delivery, and secure checkout included.

Easy returns

i

Simple return flow and responsive support for eligible items.

Peak-demand shipping delays

i

During high demand, deliveries may experience short carrier delays. Tracking updates remain active for every order.

24/7 customer support

Questions before checkout? Our team is available and ready to help.

Return & RefundEasy returns and policy details Shipping PolicyDelivery process and tracking info
Share

Why customers choose Cera Garden

Maintain balanced spa water with HTH Spa Alkalinity Up

Low total alkalinity in spa water can lead to uneven chemistry and a less comfortable soak. HTH Spa Alkalinity Up is formulated to raise the total alkalinity in your spa water and help keep pH steadier over time. The result is water that feels more balanced and can be easier to manage between treatments.

Key benefits at a glance

  • Easily raise total alkalinity to help water stay clear, balanced, and inviting
  • Reduces rapid pH changes for a more consistent water feel
  • Supports longevity of spa surfaces and equipment by reducing chemical swings
  • Compatible with bromine, chlorine, and biguanide sanitizers
  • Simple routine: test water with HTH Spa Test Strips and adjust as needed

How to use HTH Spa Alkalinity Up

  • Test your spa water with HTH Spa Test Strips
  • If total alkalinity is below 80 ppm, add HTH Spa Alkalinity Up directly to the spa water
  • Allow 1-3 hours for circulation and mixing
  • Test again and repeat as needed to maintain total alkalinity between 80 and 120 ppm

Why choose HTH Spa care

HTH has a long history of simplifying spa care, providing straightforward products that help balance, sanitize, and treat water. With HTH, you can approach spa maintenance with a clear plan and a focus on the water you love to enjoy.

FAQ

Q: What does HTH Spa Alkalinity Up do?

A: Raises total alkalinity to 80-120 ppm and helps stabilize spa water pH.

Q: How do I know when to use it?

A: Test water with strips; if TA is below 80 ppm, add product and re-test after 1-3 hours.

You may also like