Smoother Soaks: Your Essential Guide to Fixing Sandpaper Feel in Hot Tubs

By Shawn T

June 12, 2023

hot tub water

Sandpaper Feel in Hot Tub

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Ah, the hot tub. It’s an oasis of relaxation after a long day, a warm, bubbly retreat where our troubles seem to dissolve away. But what happens when your hot tub loses its charm due to a sandpaper-like feel? That’s certainly a mood killer, isn’t it? But fear not, as we’re about to dive into the nitty-gritty of how to fix the sandpaper feel in your hot tub, so you can soak up the relaxation you deserve.

How to Fix Sandpaper Feel in Hot Tub

If you’ve found yourself asking, “How do I get rid of this gritty texture in my hot tub?” you’re in the right place. Before we deep dive into the solution, let’s understand the root cause of the problem, shall we?

Understanding the Root Cause of Sandpaper Feel in Hot Tubs

Why does your hot tub feel like sandpaper? The common culprit is calcium hardness, or more specifically, calcium buildup. When there’s an imbalance in your hot tub’s water chemistry, it can lead to the precipitation of calcium, creating a gritty, sandpaper-like texture on the tub’s surfaces. Now, the real question is, how do we balance this chemistry and restore your tub to its former glory?

Balancing the Hot Tub’s Water Chemistry

Before you can fix the issue, you need to grasp how to balance your hot tub’s water chemistry correctly. The key players here are pH, alkalinity, and calcium hardness levels. Regular testing and adjustment can keep them in the right range, reducing the risk of calcium buildup. So, what’s the ideal range? Let’s have a peek.

Ideal Ranges for Hot Tub Water Chemistry

pH should be between 7.4 and 7.6. Alkalinity should sit between 80 and 120 parts per million (ppm), and calcium hardness should be maintained at 150-250 ppm. Keep these figures in mind, as they’ll serve as your roadmap for perfect hot tub chemistry.

How to Test Hot Tub Water Chemistry

Testing the water chemistry might sound daunting, but it’s as easy as pie with the right tools. Using test strips or a liquid test kit, you can evaluate the pH, alkalinity, and calcium hardness levels. Once you have the results, you can take corrective measures as needed.

Adjusting Hot Tub Water Chemistry

Once you’ve got the test results, you may need to adjust the levels of pH, alkalinity, or calcium hardness. You can use pH increasers or reducers, alkalinity increasers, and calcium hardness increasers as required. However, remember to adjust one factor at a time, and retest your water after each adjustment.

Removing Existing Calcium Buildup in Hot Tubs

Now that we’ve addressed the preventative side, let’s tackle the existing sandpaper feel. A calcium buildup can be stubborn, but with the right tools and techniques, you can get your hot tub back to being smooth and welcoming.

Tools Required for Removing Calcium Buildup

To combat calcium buildup, you’ll need a few things: a soft scrubbing brush, white vinegar, and patience. The brush will help dislodge the calcium, and the vinegar will dissolve it. Now, let’s get down to business.

Procedure to Remove Calcium Buildup

With the water drained from your hot tub, apply the vinegar liberally on the affected surfaces. Let it sit for a few minutes to break down the calcium deposits, then scrub gently with your brush. Repeat the process as needed, and voila! You’re on your way to a smoother hot tub experience.

Maintaining Your Hot Tub Post Treatment

Once you’ve restored your hot tub to its original smoothness, you’d want to keep it that way, right? Regular maintenance is key to preventing future calcium buildups.

Regular Testing and Adjustment of Water Chemistry

Remember those ideal ranges we discussed? Keeping your water chemistry within those ranges is crucial. Regular testing and adjustments can help prevent future sandpaper feels.

Frequent Hot Tub Cleaning

Apart from the water chemistry, frequent cleaning of the hot tub is essential. Use a non-abrasive cleaner and soft cloth or sponge to wipe down the surfaces regularly.

Periodic Water Changes

While balancing water chemistry helps, there’s no substitute for fresh water. Regularly draining and refilling your hot tub can help keep the water fresh and the tub free from calcium buildup.

FAQs on How to Fix Sandpaper Feel in Hot Tub

To wrap up, let’s address some common questions about fixing sandpaper feel in hot tubs.

1. Can I prevent the sandpaper feel in my hot tub?

Absolutely! Regular testing and adjustment of water chemistry, frequent cleaning, and periodic water changes can help prevent calcium buildup.

2. What causes the sandpaper feel in my hot tub?

The primary cause is calcium buildup, which results from an imbalance in the hot tub’s water chemistry.

3. How often should I test my hot tub water?

It’s recommended to test your hot tub water at least once a week. However, if your hot tub sees heavy usage, consider testing it more frequently.

4. Can vinegar harm my hot tub?

No, white vinegar is a safe and effective cleaner for calcium buildup. Just remember to rinse thoroughly after use.

5. Can I use any kind of brush to clean my hot tub?

It’s best to use a soft brush to prevent scratching or damaging the hot tub’s surfaces.

6. How often should I change the water in my hot tub?

Typically, you should change the water every 3-4 months. However, this can vary based on the tub’s usage.

Final Thoughts

A hot tub should feel like a warm hug, not a handshake with sandpaper. Fortunately, with the right knowledge and tools, you can restore your tub to its smooth, relaxing glory. Remember, an ounce of prevention is worth a pound of cure, so keep your hot tub’s water chemistry in check and enjoy many more soothing soaks in the future.


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