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How to Prevent Chemical Damage to Spa Pillows, Covers, and Surfaces

Discoloration, brittleness, or deterioration of spa pillows and covers is most often caused by chemical off‑gassing rather than a product defect. This article explains what causes chemical damage in spas and how to prevent it with proper sanitizer management and ventilation.

Overview

Bullfrog Spas are engineered for durability, but improper chemical treatment can create conditions that damage pillows, plastics, and the underside of the spa cover. The most common source of this damage is chemical off‑gassing—when strong sanitizer fumes become trapped under the cover.

Understanding how and when off‑gassing occurs allows you to prevent damage before it starts and protect the long‑term appearance and comfort of your spa.

Common Causes of Chemical Damage

Chemical damage typically occurs when sanitizer gases accumulate in high concentrations under the spa cover. This can happen for several reasons.

High sanitizer levels, especially chlorine or bromine above 20 ppm, can rapidly produce aggressive gases in hot water.

Shocking the spa with granular chlorine, bromine, or oxidizing shock products temporarily creates strong sanitizer fumes as part of the oxidation process.

Keeping the spa cover closed for long periods without ventilation allows gases to build up instead of dissipating naturally.

Ozone systems can contribute to off‑gassing if they are aftermarket units not designed for proper mixing. Bullfrog Spas use a controlled, three‑stage ozone mixing process, which helps reduce this risk.

Low effective sanitizer levels combined with organic waste such as perspiration or ammonia can lead to the formation of chloramines or bromamines. These byproducts are poor sanitizers and are prone to off‑gassing, increasing the risk of surface damage.

How Chemical Damage Shows Up

Chemical off‑gassing may result in:

  • Fading, cracking, or peeling of headrests and pillows
  • Discoloration or brittleness of plastic components
  • Premature breakdown of the underside of the spa cover

Once damage occurs, affected components usually need to be replaced. Prevention is far more effective than repair.

Step-by-Step: How to Prevent Chemical Damage

Maintain Proper Sanitizer Levels

Keep chlorine or bromine within recommended ranges at all times. In hot water, sanitizer levels can change quickly, so regular testing is essential. Testing at least twice per week is strongly recommended, and more often during periods of heavy use.

Vent the Spa After Shocking

Any time you add a shock treatment or granular sanitizer:

  • Open the spa cover
  • Run the jets
  • Leave the cover open for 15–20 minutes

This allows excess sanitizer gases to escape before they can concentrate under the cover.

Visual callout suggestion: Illustration showing the cover open with jets running after a shock treatment.

Air Out the Spa Weekly

Even if the spa is not used, open the cover fully at least once per week. This releases any accumulated gases and allows condensation inside the cover’s vinyl skin to drain. Doing so helps extend cover life and prevents excess water weight buildup.

Use Approved Ozone Systems Only

Only use ozone systems approved for Bullfrog Spas. Aftermarket ozone systems that bypass proper mixing can significantly increase off‑gassing and chemical damage risk.

If your spa has ozone, ensure it is functioning correctly. Ozone helps break down chloramines and bromamines, reducing harmful byproducts.

Manage Chloramines and Bromamines

If sanitizer seems less effective or strong odors persist, chloramines or bromamines may be present. Standard test strips measure free, active sanitizer, but additional testing can reveal total chlorine levels.

Your authorized Bullfrog Spas dealer can assist with testing and guide you through breakpoint chlorination if needed. Proper shocking and consistent sanitizer levels prevent these byproducts from accumulating.

What to Expect With Proper Care

When sanitizer levels are maintained correctly and the spa is properly ventilated:

  • Pillows remain flexible and intact
  • Covers last longer and retain their structure
  • Plastics and surfaces stay clean and undamaged
  • Overall water care becomes easier and more predictable

If Damage Has Already Occurred

If pillows, covers, or components are already showing signs of chemical damage:

  • Review your sanitizer levels and shock routine
  • Improve cover ventilation practices immediately
  • Replace damaged components as recommended by your dealer
  • Adjust water care habits to prevent recurrence

Your Bullfrog Spas dealer can help evaluate damage and recommend next steps to restore proper operation and appearance.

Confidence in Long-Term Spa Ownership

Bullfrog Spas are designed for a premium, low‑stress ownership experience. By maintaining recommended sanitizer levels, ventilating after chemical additions, and using approved systems, you protect both your spa components and your investment.