Why Do I Have Rust Stains On My Pool Floor?

Owning a pool is a real pleasure—until you start noticing unsightly rust stains on the pool floor. Nothing says “maintenance issue” quite like a rusty patch interrupting the clean, clear look of your pool’s surface. But don’t worry. If you’re seeing rust stains, this article will help you understand exactly what’s going on and guide you on the next steps. We’ll break down what causes these pesky stains, why they’re a sign that resurfacing might be due, and how to get back to a smooth, spotless pool.

What Causes Rust Stains in Pools?

First off, let’s talk about the “why.” Rust stains in pools aren’t random; they’re the result of a few clear culprits. These stains come in a range of colours, from reddish-brown to dark orange, and they often look like cloudy spots or jagged streaks. Here are the main reasons you might find rust marks on your pool floor:

1. Metals in the Water – This is one of the most common causes. When metals like iron or copper are present in the water, they can react with the pool’s chemicals, leading to oxidation (rusting). Copper can leave green or blueish stains, while iron results in more classic reddish or brown rust.

2. Pool Equipment – The metal parts of pool equipment—like ladders, railings, and even screws—can corrode over time if they’re exposed to water consistently or if they aren’t made from rust-resistant materials. This corrosion often leads to rust streaks or spots near the equipment.

3. Rebar and Structural Elements – Rebar, the steel reinforcement inside your pool’s concrete shell, can corrode if it’s too close to the surface. When the concrete cracks, water can seep through and cause the rebar to rust, creating stains that gradually work their way up to the surface.

4. Mineral Deposits from Hard Water – Hard water is loaded with minerals, which can build up on the pool’s surfaces. Over time, these deposits start to oxidize, especially around high-use areas like steps and ladders, which can lead to rust-coloured stains.

5. Pool Chemistry Imbalances – Pool water that’s either too acidic or too alkaline can start to wear down the pool’s protective coatings or surfaces, making it more susceptible to rust stains. Acidic water is especially corrosive, increasing the chance of stains on your pool floor.

How Rust Stains Signal the Need for Resurfacing

So, if you’re spotting these stains, it’s often a hint that you need swimming pool resurfacing services. Why? Because rust typically means that your pool’s current surface has been compromised. Pool surfaces aren’t supposed to let water through, but when they get worn down, small cracks and pinholes can allow water to seep in. This not only contributes to rust stains but can also worsen them over time. Here’s why resurfacing is a solution worth considering:

It Protects the Pool Structure – Resurfacing creates a fresh, impermeable layer, preventing water from getting to structural elements like rebar, which is especially prone to rusting. This means you can avoid costly structural repairs down the road.
It Improves Pool Aesthetics – No one wants to look at a stained pool floor, right? Resurfacing restores your pool’s original appearance, making it look new again, minus the unsightly stains.
Increases Pool Longevity – Resurfacing isn’t just cosmetic. It adds years to your pool’s lifespan by safeguarding the concrete and other materials from wear and chemical exposure.
Boosts Pool Safety – As surfaces wear, they can become rough or pitted, which isn’t ideal for swimmers’ feet. A new surface is smooth, clean, and safe for everyone.
Easier Maintenance – Rust and other stains are harder to clean from a compromised pool surface. When you resurface, maintaining a clean pool becomes a breeze, saving you time and effort in the long run.

DIY Tips for Rust Removal (But Don’t Skip the Resurfacing!)

While resurfacing is often the best long-term solution, you might want a quick fix for those stains while you get your resurfacing project sorted. Here are a few effective DIY tricks for rust removal:

Vitamin C Tablets – Believe it or not, vitamin C (ascorbic acid) is great at breaking down rust. Simply crush up a few tablets, sprinkle them over the stain, and give it a few minutes before scrubbing with a brush.

Baking Soda Paste – For gentler cleaning, mix baking soda with a bit of water to form a paste. Apply it to the stained areas and scrub lightly. This method works well if the rust is on tiles or metal areas.

Lemon Juice and Salt – The acid in lemon juice combined with salt creates a mild abrasive that can be helpful for rust stains. Let it sit on the stain for 10-15 minutes before scrubbing.

These methods are temporary fixes, though. If the stains keep coming back, it’s a sure sign the pool surface needs more serious attention, and resurfacing is a wise choice.

Choosing the Right Pool Resurfacing Option

When it comes time to resurface, you have a few options. The ideal choice will depend on factors like your budget, pool usage, and desired look. Here are some popular resurfacing materials:

Plaster – This classic choice offers a smooth and durable finish. It’s affordable, though it may need touch-ups every 7-10 years.
Pebblecrete – For a more natural look, pebblecrete includes small pebbles within the surface, making it slip-resistant and long-lasting.
Fibreglass – A pricier option but incredibly durable, resistant to staining, and smooth to the touch.

Each material comes with its pros and cons, so consider what matters most to you in terms of upkeep, durability, and appearance.

Time to Reclaim Your Pool’s Sparkle

Rust stains don’t have to be a permanent fixture in your pool. With the right resurfacing solution, you can say goodbye to those stubborn stains and hello to a refreshed, stain-free pool. When you spot rust, consider it a sign that your pool surface is in need of an upgrade. Whether you go with plaster, pebblecrete, or fibreglass, resurfacing will not only restore the look of your pool but will also extend its life and improve your overall swimming experience. So why let rust keep you out of the water? Take the plunge and give your pool the care it deserves.

Image Source: Freepik