Brown water is typically caused by metals such as iron or manganese. Use a metal sequestrant to remove the metals and prevent staining or discoloration.

What Causes Brown Water In A Freshly Filled Hot Tub?

Hot tubs may develop discolored water immediately after filling. Here are the top reasons:

1. Metals In Source Water

Tap water, well water, and even some city water can contain dissolved metals. When chlorine or bromine is added, it reacts with these metals, causing them to oxidize and turn the water brown or orange.

Common metals causing discoloration:

• Iron

• Manganese

• Copper (sometimes causes green tint)

2. Dirty Or Rusty Garden Hose

Your hose may look clean, but it can carry bacteria, dirt, or even rust. If the hose sits in the sun or has not been flushed out, you may be transferring grime directly into the tub.

3. Organic Contaminants

If you filled the hot tub from a source with leaves, dust, or organic materials, it can cause water discoloration and odor. These contaminants can also disrupt water chemistry.

4. Poor Water Filtration At The Source

Municipal water systems sometimes flush their pipes, sending out discolored water temporarily. Well water can also be untreated or poorly filtered.

How To Fix Brown Water In A Hot Tub

Luckily, brown water is usually fixable without needing to drain the tub right away.

Step 1: Test For Metals

Use a test strip or bring a water sample to a local pool store. Check for iron, copper, and manganese levels.

Step 2: Add A Metal Sequestrant

These products bind with metals in the water, preventing them from oxidizing and staining the surface.

• Follow label instructions

• Run jets for 30 minutes

• Repeat weekly if your water source contains metals

Step 3: Clean The Filter

The filter may have collected particles or rust. Rinse or soak it in filter cleaner.

Step 4: Shock The Water (Only After Sequestering)

Once metals are bound, use a chlorine shock to clean the water. Shocking before adding a sequestrant can worsen discoloration.

Step 5: Monitor And Repeat

Check water clarity and retest metal levels. Sometimes more than one treatment is needed.

How To Prevent Brown Water Next Time

Avoid the frustration by planning your next fill more carefully.

Use A Hose Filter

Attach a filter to your garden hose when filling the tub. It helps catch metals, dirt, and contaminants before they enter the spa.

Flush The Hose First

Before filling, run water through the hose for 30 seconds to clear out any rust or residue.

Add Sequestrant Before Sanitizer

Adding a metal control product before chlorine or bromine can prevent metals from oxidizing in the first place.

Use Clean, Filtered Water If Possible

If you have access to a water filtration system or treated water, use it to fill your spa.

What If The Problem Persists?

Persistent brown water may indicate ongoing issues with your water source or spa system.

Consider Draining And Refilling

If discoloration remains after multiple treatments, the best option is to drain, clean, and refill with filtered water.

Inspect Plumbing And Components

Old pipes, deteriorating fittings, or a corroding heater can contribute to recurring issues.

Call A Water Expert

A professional can test your water and recommend a permanent filtration or treatment solution.

Safe Soaking After A Fix

Once your hot tub water is clear again:

• Balance pH and alkalinity

• Maintain proper sanitizer levels

• Clean the filter weekly

• Use metal control monthly if needed

Brown water is annoying but solvable. With the right steps and products, you can turn that murky mess into a clean, relaxing soak.