In order to keep the ions in solution, maintenance doses are needed according to individual product directions. Your Email. Sequestering agents are typically sold as a liquid in 1 quart or larger bottles, however, there are granular options as well. The agent should be poured around the perimeter of the pool or can be poured into the skimmer as well.
You should always read and follow all safety precautions on the product labels. Keeping your pool or spa safe means keeping yourself and others around you safe while maintaining your chemistry and your equipment.
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Connect with us. Sequestering Agent Reviewed by. Full Bio. View our Editorial Policy. What Does Sequestering Agent Mean? Corrosionpedia Explains Sequestering Agent A sequestering agent surrounds another molecule or atom and holds it "in seclusion. Sequestering is not the same as precipitation, because sequestering does not form a solid. The main types of commercial sequestering agents include: Aminocarboxylic acid base products Phosphates and phosphonates Hydroxy carboxylates Polyacrylates Sugar acrylates Using Sequestering Agents for Cleaning and Water Treatment Unfortunately, calcium and other hard water ions readily combine with surfactants in detergents, thus reducing their cleaning effectiveness.
The Difference Between a Chelating Agent and a Sequestering Agent A chelating agent is a chemical compound that can bind with a metal ion and prevent that metal from undergoing other chemical reactions, while a sequestering agent is a chemical compound that is capable of forming a complex with metal ions and helps to remove these ions from a solution.
Related Question What are some of the new methods behind the treatment of microbiologically induced corrosion? Bama Rambler Mod Squad. TFP Expert. Bronze Supporter. Jun 22, 24, SouthWest Alabama. Sequestering agents are designed to keep metals in suspension so they don't tint the water but most importantly they prevent the metals from staining surfaces.
I'm sure that's why your plaster mfg requires them. They don't want a customer service issue cuased by staining because of metals. Bama Rambler said:. Click to expand While it would certainly be safe not using it, the problem comes IF you have a problem. Then the mfg might deny warranty because you didn't follow their guidelines.
While it should be only the case if there is discoloring, etc. There is usually a test with the agent for testing the dosage.
Aug 20, 1, North Central Texas. HEDP Sequestrant can save you a lot of headaches down the line. It helps prevent calcium deposits and will ward off staining of your surface. I don't have copper or iron in my fill water BUT I have copper staining on my blue plaster from using Ionization for years, that threw copper into the water constantly. Copper staining is virtually impossible to get rid of without removing a lot of the plaster with acid washing.
Sometimes that won't even work my case. I don't have iron in my fill water but it gets into the pool from our dust, sand, and silt. If I don't use sequestrant, it will stain the remaining white scale in a few days. Sequestrant and never allowing the pH to go above 7. I help it, too, by brushing with an aluminum brush.
The copper stains may be lightening a bit but that observation might be a result of wishful thinking. I had heavy scaling on the steps. When the pool was empty for an acid wash in I spent two hours with an angle grinder, using concrete disc to remove the scale on just one step. I had to stop that work due to an injury. The scale has been releasing slowly on the top two steps. Top step had some copper staining that glazed over the surface of some of the scale making it much harder to remove.
This week I spent some time really going after that with a small aluminum brush and finally got it to release. Who wants to do this when it can be prevented?
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