Solved! How do I fix my cloudy blue pool water?

How do I fix my cloudy blue water? So, you have an ugly cloudy blue pool that you want to fix now! You came to the right place. We have an all-in-one solution for you, complete with easy-to-use, step-by-step directions directly from Dr. Joe! This is the DIY easy way to get rid of your cloudy blue swimming pool water!

If your swimming pool water is clear and blue, but not cloudy, click here for the Clear Blue Water Treatment.

Cloudy Blue Pool Solution
Cloudy Blue Pool Fix
Cloudy Blue Pool DIY

Use our step-by-step guide for fixing cloudy blue swimming pool water below.

Items needed to fix your cloudy blue pool water:


We recommend using liquid chlorine for this process.

Copper-Based Algaecide

A copper-based algaecide (Dr. Joe recommends Bio-Dex Aqua Pure) works with chlorine to kill organics. Follow the directions on the algaecide label.

Super Metal Stain Eliminator Kit

Super Start-Up is an extra strength sequestering/chelating agent that holds stain-causing metals, like iron, copper, and manganese in suspension.  

Rust and Iron Stain Remover reduces the suspended oxidized iron (rust) into its clear ionic form.

Copper Stain Remover reduces the suspended oxidized copper into its clear ionic form.

CuLator Ultra 4.0 removes and eliminates dissolved iron and other metals from the swimming pool.

Purchase our Super Metal Stain Eliminator Kit and use the step-by-step instructions below to solve your cloudy blue swimming pool water problems!

Follow these directions step-by-step

Print off the Step-By-Step Guide Here.

Prior to starting this procedure read all instructions. Make sure to properly balance the pool and spa water, but the free chlorine level should be below 0.5 ppm. IMPORTANT: The pool should not be used until the procedure is completed and the pH is 7.2-7.8 and free chlorine level is between 1.0 ppm and 4.0 ppm.

Balanced Pool Water Guide: Free Chlorine: 1-4 ppm, Total Chlorine 1-4 ppm, Combined Chlorine 0, pH: 7.2-7.8, Calcium Hardness: 200-400 ppm, Alkalinity: 80-120 ppm, Cyanuric Acid (CYA) 30-50, Iron: 0 ppm, and Copper: 0 ppm.

Step 1.

After balancing the pool water, start by using a leaf net to remove any floating debris and carefully remove any settled debris from the pool.

Step 2.

Brush the pool surface to loosen any settled debris.

Step 3.

Vacuum any remaining debris to waste.

Step 4.

Continue to run the pool’s filtration system to help remove suspended particles. You may have to clean your filters if the pressure increases.

Step 5.

Make sure your alkalinity is between 60-120 ppm and your pH is between 7.2-7.8

Step 6.

If you cannot see the bottom of the pool, add a copper-based algaecide (Dr. Joe recommends Bio-Dex Aqua Pure). Follow the directions on the algaecide label.

Step 7.

Add chlorine to the pool until the level is between 5-10 ppm. Allow the filter pump to run for 12-24 hours. This helps to remove algae and other organics.  

Step 8.

Super Start-Up: Thoroughly shake until the solids are completely suspended. Walk around the edge of the pool adding Super Start-Up to the water. IMPORTANT: Make sure that the proper amount of the contents of the bottle are added (Full quart bottle for 20,000 gallons, 3/4 bottle for 15,000 gallons, 1/2 bottle for 10,000 gallons and 1/4 bottle for 5,000 gallons.  Do not over-use Super Start-Up or you can lock up your chlorine).

Allow the Super Start-Up to circulate in the pool for 1.5 to 2 hours.  You may see discolored water out of the returns.  This is normal and will dissipate in a few hours.

If your pool water is now clear, CONGRATULATIONS! Place the CuLator Ultra 4.0 into your pump basket and balance your pool water. You are done!

If you cannot see the bottom of the pool continue to the Steps 9-13.

Step 9.

Place CuLator Ultra 4.0 into your pump basket. CuLator removes and eliminates metals, which prevents metal staining and water discoloration.

Step 10.

Wait for the chlorine level to go below 0.5 ppm. This may take a few days.

Step 11.

Walk around the edge of the pool adding 1 bag of Rust and Iron Stain Remover and 1 bag of Copper Stain Remover. This will both reduce the chlorine level to 0 ppm and help to remove the blue or other color of the water.

Step 12.

Run the circulation pump for 2 hours.

Step 13.

When the water is clear and colorless, start to slowly add chlorine (1/8 of a lb. of powdered chlorine or 1/4 gal. of liquid chlorine per hour, per 20,000 gal.) until the level reaches 1-4 ppm.  The pool water may go cloudy*, which is normal, and may last a few days to several days. It may take a large amount of chlorine before the chlorine holds. Finish balancing the pool water and maintain a chlorine level between 1-4 ppm.

Important: After 12 hours, even if the water still has color, you MUST start to add chlorine until it holds at 1-4 ppm to avoid an algae bloom. Slowly add chlorine (liquid chlorine is preferred) to the pool. If you are using “pool shock” to add chlorine to the water, add no more than 1/8 of a 1 lb. per hour. If you over-chlorinate the pool, you risk staining your pool surface.  Follow all steps for best results.

Keep the chlorine level between 1-2 ppm for 3-4 weeks. DO NOT OVER-CHLORINATE WITH LIQUID OR POWDERED CHLORINE OR SHOCK DURING THIS TIME. (If you allow the chlorine level to exceed 4 ppm the blue water may return and surface staining may appear). Keep the filtration system running for a minimum of 12 hours per day until the water is clear. 

*Note: The pool water may temporarily turn cloudy due to the chlorine removing excess Stain Removers. Once the excess Stain Removers are gone, the cloudiness will disappear, and you will be able to hold and measure chlorine in the pool water.  This may take several days. 

Buy the Super Metal Stain Remover Kit!

You have the solution for cloudy blue pool water!

Blue Cloudy Water Solution Before Treatment
Before Treatment
Blue Cloudy Water Solution After Treatment with Super Metal Stain Eliminator Kit
After Treatment
Periodic Products' Metal Stain Eliminator Kit for Pools and Spas

Is Your Pool Surface  Stained?

Remove those stains with the Metal Stain Eliminator Kit!

How do I prevent ugly blue pool water?

It’s easy to prevent nasty blue water in the future. Simply keep your water balanced and chlorinated and use our Trifecta System:

  1. Pre-Filter source water with FillFast.
  2. Sequester any additional metals with Super Start-Up or Mega Maintain.
  3. Place a CuLator Ultra 4.0 in your pump basket.