Sequestrant Pool: How to Remove and Prevent Metal in a Pool


Having a swimming pool means that you need to check the chemical composition of its water. Testing for total chlorine, calcium hardness, and pH should be part of your weekly maintenance. 

Sometimes, problems can develop that lead to discoloration due to metals or algae in the pool. Iron can make the water to look greenish or brown, and copper can result in greenish water. 

Manganese can make the walls to have black stains. To clean these metals out of your pool, you need a pool sequestrant. 

What is a Sequestrant?  

Sequestrants or chelants are chemical compounds made to bind liquified metal salts in a pool. You can add them to your cleaning formula for two main reasons:

  • To dissolve scale on equipment surfaces 
  • To keep hardness ions like magnesium and calcium from precipitating 

While acids dissolve scale, alkaline and neutral cleaning solutions often require sequestrant material to clean and provide hardness of ions.

Some models work by ensuring every hardness ion is kept bound (complexed) by a sequestrant molecule or stoichiometric sequestrants. These materials are needed for various cleaning systems, mainly when you reuse cleaning solutions, to provide stability of the cleaner against scale precipitation. 

Some sequestrants work as threshold cleaners. Their molecules effectively prevent the development of scale crystals in solutions so that a few sequestrant molecules can easily stabilize a huge number of scales creating ions. 

A threshold agent is mixed with an acid or alkaline solution to prevent scale formulation when rinsing your pool, especially hard water one. One strong sequestrant pool that is quite strong is ethylene diamine tetraacetic acid or organic acid, and it doesn’t act as a threshold agent. 

Carboxylate, phosphonates, and tripolyphosphate polymers can function as both threshold and stoichiometric agents. Thus, you can use them with strong sequestrants or individually, depending on what you are cleaning. 

Sequestrant for Pool Water: Cleaning Minerals 

Let’s look at the things you will need:

Here are the steps that you will follow:

  1. Test your swimming pool water to find out if it is unbalanced. 
  2. Scrub the walls and bottom of your pool with a bush to get rid of metal particles and stains.
  3. Add a metal sequestrant into your pool – follow the package’s instructions.
  4. Leave the filter to operate for 48 hours to get the metal out of the water.
  5. Remove and clean the filter at least four times during this process to get rid of removed metal.
  6. Shock your pool using chlorine.
  7. Let the filter to run for 24 hours.
  8. Test the water pH and adjust accordingly using sodium carbonate to boast pH (alkalinity) or muriatic acid for lower pH (boasts acidity).

Note: Check your pool’s equipment like heaters and pipes since they can also cause corrosion. Replace them regularly.

Final Word

Sequestrants are a good product that you can add to the cleaning solution to remove metals from your swimming pool. You can follow the above steps to get a clean swimming pool (above ground pool or inground pool)

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