Why does the spa smell?

Author: Scarlett McGlynn  |  Last update: Wednesday, March 25, 2026

Hot tub smells can be caused by various factors, including bacteria, algae, and dirt buildup.

How do I stop my spa from smelling?

Quick Tip 102, Eliminating Water Odor

Your water can emit an odor if there's low levels of sanitizer, your pH is out of range, or there's bacteria or algae growth. For addressing this issue we will potentially need either dichlor chlorinating granules, pH Up, or pH Down.

What is the scent that spas use?

Lavender is the queen of spa scents. Known for its calming and relaxing properties, lavender is a staple in spas worldwide.

How do you get the smell out of a hot tub?

To offset the foul smell, you should hyper-chlorinate your hot tub and circulate the water for 30 minutes to sanitize and completely remove the harmful bacteria inside. Afterwards, leave the cover open for at least 1-2 hours to allow the remaining gases to ventilate out.

How do you fix smelly hot water?

Sometimes, organic matter in the water can cause odd smells when heated. You could also try sanitizing the water system with hydrogen peroxide, which is effective against bacteria and safe for home plumbing. If you're still stumped, consulting with a different plumber for a second opinion could give you fresh insights.

Why Does the Water in My Hot Tub Smell Bad

How do you neutralize smelly water?

Chlorination can kill sulfur bacteria. If all bacteria are not destroyed by chlorination, the problem may return within a few weeks. Increase the water heater temperature to 160 degrees Fahrenheit (71 degrees Celsius) for several hours. This will destroy the sulfur bacteria.

How often should I flush my water heater?

Most homeowners should flush their water heaters every 6 months or so, but if you have extremely hard water, you may want to do it more often. Flushing your hot water heater could be necessary as often as every few months depending on the mineral content of your local water supply.

Why does my hot tub water smell funky?

Hot tubs with smelly water often result from: Low sanitizer levels. Inadequate pH management. A dirty spa filter.

How to make your spa smell good?

Essential oils: Lavender, camomile, geranium and rose. “Lavender is the obvious pick, but geranium can be just as calming. Flora Remedia has a Calm Aromatherapy Roll On that includes notes of geranium which gives a beautiful musky, floral and feminine scent. Rose is also peaceful and calming.”

Does adding vinegar to a hot tub make it smell?

It cleans and deodorizes, and is naturally safe to use around people and pets. Vinegar can help prevent clogs in your hot tub jets, eliminate bacteria, and clean away water spots and other residue.

Why do spas always smell good?

One of the primary tools spas use to maintain their signature scents is the essential oil diffuser. These devices disperse tiny molecules of essential oils into the air, creating a consistent and pleasant aroma.

How can I make my spa pool smell nice?

Turn Your Stinky Hot Tub Into a Restful Oasis With These Tips
  1. Balance – Aim for water pH between 7.2 – 7.6, and total alkalinity between 80 – 120ppm.
  2. Sanitize – Most hot tubs work best with bromine. ...
  3. Shock – Shocking breaks down organic waste contaminants that cause odor and cloudy water.

What is the classic spa smell?

Eucalyptus. Hands down one of the most classic spa fragrances is eucalyptus. Known for being minty, green, and slightly citrusy, eucalyptus is one of those fragrances that is sure to make any space feel instantly fresher.

How often should I shock my hot tub?

In essence, shocking your hot tub or swim spa means adding a higher than usual dose of oxidiser chemicals to the water. This is also known as oxidising. We advise everyone to shock their water once a week to reduce bacteria and impurities. You can do this with one of two products; chlorine shock or non-chlorine shock.

Why does my hot tub cover smell?

When your hot tub cover becomes waterlogged, it can obtain a heavy mildew smell. This happens because stagnant water from the rain, and condensation from within your hot tub, slowly soak into the cover.

How often should I drain my hot tub?

With average use, your hot tub should be drained and refilled about once every three or four months. But since everyone uses their hot tub differently, the answer can vary based on how many people use it and how often. Hot tub manufacturers like Jacuzzi offer some handy tips for figuring out when to drain and refill.

How do you get rid of the smell in a spa?

To offset the foul smell, you should hyper-chlorinate your hot tub and circulate the water for 30 minutes to sanitize and completely remove the harmful bacteria inside. Afterwards, leave the cover open for at least 1-2 hours to allow the remaining gases to ventilate out.

What scent is used at most spas?

Lavender: Renowned for its calming and relaxing properties, lavender's floral, sweet, and slightly herbaceous scent is often used to reduce stress and induce relaxation. Peppermint or Spearmint: These minty fragrances add a cooling, invigorating aspect to the spa environment, refreshing both the air and the mind.

Can I put essential oils in my hot tub?

You should never add essential oils to your spa or hot tub. What might be intended to improve your relaxing experience, can in fact do the exact opposite! Essential oils can clog up your filtration system and cause blockages in your spa pipes and pumps.

Why does my hot water smell so bad?

The most common reason for the odor is stagnant water in your plumbing system, particularly within the hot water heater.

How do I know if my hot tub has bacteria?

The odour is often described as “musty” or “sour.” Cloudy or Discolored Water: Bacteria can cause the water in your hot tub to turn cloudy, murky, or even greenish in colour. If you notice any unusual changes in the appearance of the water, it could indicate bacterial contamination.

How to fix smelly pool water?

The most efficient way to remove chloramines from your pool is by shocking or super-chlorinating it. The goal is to achieve “breakpoint chlorination,” a process that involves raising the chlorine levels to 10 ppm or more for at least 4 hours then bringing it back down to normal levels of 5 ppm or less.

What happens if you never flush your water heater?

-Reduced Efficiency: As scaling collects at the bottom of the tank, your water heater will become less effective at heating the water in the tank. -Corrosion: If your water heater goes long enough without a proper flush, you could also have corrosion attacking the tank itself, weakening its structural integrity.

How much does a plumber charge to flush a water heater?

The national average cost to flush a water heater is $160, but prices can vary in increments based on the tank size. A 30-gallon tank will cost between $90 and $120 on average, while a 70-gallon tank could cost anywhere between $180 and $250.

Can I flush my hot water heater myself?

You can flush your water heater yourself if it's done on a regular basis. This guide will take you through the steps to drain and flush a gas or electric water heater. Learning how to clean a water heater is an essential part of maintaining your plumbing system.

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