Get Rid of White Mold in a Hot Tub – The Easy Way

After a long, tiring day, when all you want to do is soak your worries away in your hot tub, seeing icky white stuff on the walls of the tub (and in bad enough cases, in the water too) can worsen an already bad day! Hello, white water mold.

Don’t worry too much, though, as we said, it may be icky but white mold is an extremely common problem and one that can be solved relatively easily (be thankful it isn’t a clogged filter or a hot tub rash!).

Here’s all you need to know about solving your white mold problems!

Get Rid of White Mold in a Hot Tub

What is White Water Mold – and What Causes It?

The better you know what something is and why it occurs, the easier it gets to solve the problem. Though some people will swear by this, white water mold is not, in any form or measure, algae related; it is neither a type of algae nor is it caused by algae.

What, then, is it? Well, white water mold is a naturally occurring form of fungus, making it more of an animal related issue than a vegetable related one. Since white water mold occurs naturally, it’s an issue that all hot tub owners need to keep an eye out for.

This mold most commonly occurs as a result of improper cleaning and irregular water checks; with these, it can really claim your tub, lock, stock and twenty barrels!

Once the mold sets in and starts flourishing in your tub, getting rid of it can be a little Herculean, but the great news is that with the right effort, you can bid your mold woes adieu.

How to Get Rid of White Water Mold

The important thing with white water mold? As soon as you see it, get to fixing it! The longer you defer addressing the problem at hand, the more permanent the white water mold becomes, in your tub.

Here are the steps to get rid of white water mold in your tub:

  • Drain your tub completely.
  • Using a hot-tub cleaner (the ‘Oh Yuk Healthy Hot Tub Cleaner’ is a great bet), cleanse all the walls and surfaces of the tub. Really go to town on areas where the mold is visible and scrub away!
  • Give the hot tub filter a chemical cleanse; just a plain rinse will not do the trick. If your filter is over a year old, it may be prudent to throw it out and put a new one in its place.
  • Use a hose filter to refill the tub with fresh water.
  • Shock the hot tub. It helps to use at least a triple or quadruple dose of whatever chemical you’re using for the shock.
  • Once you’ve shocked the water and let the magic work, drain the hot tub out completely, again and refill it.
  • Shock the water again, but this time, use a normal amount.
  • After the last shock, test the water. Ensuring that alkalinity, pH levels and chlorine levels are all balanced helps keep the water sanitized and cloudless for longer.

You can test the water by using liquid testing kits, or test strips like the ones that AquaChek sells, that give you the levels of total chlorine, bromine, hardness, pH, alkalinity, free chlorine and cyanuric acid in seconds. You could also take a water sample and have your local pool facility or hardware store test it for you.

Yep, getting rid of white water mold is a little back breaking, but before you complain, remember no pain, no gain! And nope, the job doesn’t end here, so don’t sit back on your laurels – regularly testing the water and monitoring it for signs of the fungus are important.

If you see anymore, even the slightest bit (fungus can multiply notoriously quickly and easily, so don’t ever write off even the tiniest bit), repeat the whole process listed above.

How to Prevent White Mold Growth

It isn’t without reason that whoever said it, said that prevention is better than cure. Getting rid of white water mold can be a pain in the well, everywhere and if you read the above bit, you’re probably emphatically nodding your head in agreement to this.

Therefore, if you don’t want to treat white water mold, prevent it. Here’s how:

  • Give your hot tub’s walls a thorough brushing at least once a week. Use a scrub brush for the best results.
  • Regularly check the water quality and add any chemicals necessary to oxidize the contaminants in the water.
  • If it’s doable, give your hot tub some sun. Sunlight is the best cure for a range of issues and white water mold is one of them! The UV rays act as a natural oxidizer and will help quash the mold.
  • Chemically cleanse your filter every month. Consider replacing extremely old filters.
  • Clean anything that goes into your tub frequently – Mr. Rubber Duck, the water floats, the whole arsenal.
  • If you’ve treated yourself to an hour long session of rinse, cleanse, shampoo, repeat, shock the tub to keep the water clean (the SpaGuard Enhanced Dichlor Shock comes highly recommended). In fact, regular spa shocking helps maintain the optimum quality of water.
  • Regularly test the pH, calcium hardness and alkalinity in the tub.
  • It is recommended that you run the tub at least six hours a day to make sure that the water is properly filtered and cleaned every day.
  • Drain your hot tub and clean its walls and surfaces regularly.

The Final Word

Though it may seem like a bit of work, incorporating hot-tub-maintaining tasks into your daily schedule will make things easier and prevent any white water mold worries, since the mold has never won a battle against a clean, well maintained tub.

White water mold is exceedingly common, but no one wants to deal with it this is why it’s better to take the steps to prevent this than deal with it when it does show up.

Additionally, letting things be and not taking the steps to maintain your tub will not just lead to issues with white water mold, but to a range of other equally annoying contaminants that take as much work (if not more!) to get rid of.

If your tub does fall prey to white water mold, worry not. Though it takes a fair bit of work, you can get rid of it and with the right, proper maintenance and cleaning, you won’t have to worry about mold again.

So, the moral of the story – regularly clean and maintain your hot tub to prevent problems like white water mold!

michael keenan author

Author - Michael Keenan

I'm Michael Keenan the owner and creator of the Outdoor Care Guide. I'm a trained horticulturist with over 30 years experience in pool care, plant care and landscape care! Seemed like a good idea to share - I think I can make your life easier and save you some time and money!