Water Treatment Chemicals


Ethylenediaminetetraacetic acid (EDTA) has a proven record of aiding in the protection of water treatment pipes and equipment. Bell Chem, the water treatment chemical supplier you can trust in Central Florida, carries this chemical for its ability to effectively sequester metals within pipes.

Deposition is a fact of life for water treatment plants. Water purity determines the likelihood of deposits left within the boilers and other portions of the feed lines. When feedwater contains even the slightest amount of impurity, the possibility of buildup along any metal surface is almost guaranteed.

Contaminants common in feedwater include metals (magnesium, copper, iron, aluminum), nonmetals (calcium and silica), silt, and oil. These categories are identified as either scale or sludge. Scale is formed by salt crystals that adhere to surfaces while sludge precipitates outside the water treatment system and is transported to the metal surface of the treatment system by means of incoming water.

Scale formations are soluble until they concentrate due to the high heat transfer rates that drive evaporation. Because the crystalline structure of scale is homogeneous, different areas of scale may have completely different chemical compositions and require varied methods of removal. Both metals (magnesium, aluminum, and iron) and nonmetals (calcium, silica, and occasionally sodium) can create scale. Scale forms extremely slowly, which causes the buildup to be hard, dense, and well defined, giving scale the ability to withstand most mechanical and chemical cleaning.

Sludge deposits may also prove to be dense, hard, and difficult to remove, especially after exposure to extreme heat levels, which bakes the sludge onto the surface of the water treatment equipment. Baked sludge is similar to scale in its tenaciousness.

Once either sludge or scale forms inside a facility, the chemical contaminants attract like chemicals. This results in larger and larger patches of affected metal. These accumulations inside pipes can significantly increase water pressure because the diameter of the pipes diminishes, causing overheating and, especially with salts, corrosion. Removing scale and sludge results in facility downtime.

EDTA acts to chelate every known metal on the periodic table. When metals are sequestered by EDTA, they lose a portion of their reactivity to each other and any other ions, rendering them nearly passive. As a water treatment chemical, EDTA is generally a colorless, water-soluble solid marketed as disodium EDTA or calcium disodium EDTA. Adding EDTA to water filtration systems greatly reduces scale and sludge, thereby decreasing unscheduled maintenance and replacement of equipment.

The water treatment chemical supplier experts at Bell Chem stock BC EDTA-100 knowing its importance in keeping water facilities online and running smoothly. Contact Bell Chem today at 407-339-2355 (BELL) to inquire about EDTA and their other water treatment chemicals. Our news page has a generous offering of our line of chemicals for industrial use.

Your Corrosion Inhibitors Guide

Corrosion is the destruction of a metal by a chemical or electrochemical reaction with its surroundings. Some of the most caustic chemical reactions involve oxygen. The most easily noted reaction is the production of rust from the reaction of oxygen and iron. Controlling this reaction, as well as others, takes chemicals specific to each reaction. Water treatment plants have all the necessary components to harbor myriad types of corrosion. The chemicals, temperature, ambiance, and pH are all factors in the health of the pipes and tanks within a water treatment facility. Bell Chem, experts in water treatment chemicals, have created this handy guide on the chemicals needed to keep corrosion under control. Read on for the most reliable chemicals and their role in water treatment.

  • Deaeration is the removal of water from pipes and tanks. Since water is chemically composed of oxygen and hydrogen, when oxygen is removed, corrosion is less possible. Deaeration is achievable with the addition of eight parts catalyzed sodium sulfite for each one part dissolved oxygen.
  • Passivating (anodic) inhibitors form an oxide film on the walls of pipes and tanks, acting as a protective barrier. This form of corrosion control is inexpensive and, in many instances, self-repairing. Passivating inhibitors include nitrite, molybdate and orthophosphate. Nitrite works well in systems where oxygen is not present; molybdate is effective, but cost inhibitive, and orthophosphate is the most widely used because of its low cost and efficiency.
  • Precipitating (cathodic) inhibitors form insoluble precipitates on metal surfaces. Precipitating inhibitors do not form as stringent barrier as passivating inhibitors, and while they repair with no outside influence, the repair time is much longer than anodic inhibitors. Zinc precipitates as hydroxide, carbonate, or phosphate to form a precipitating inhibitor. Calcium orthophosphate and calcium carbonate are also effective precipitating inhibitors.
  • Copper corrosion inhibitors include benzotriazole and tolytriazole, which bond with cuprous oxide to form a chemisorbed film on the metal surface.
  • Adsorption inhibitors block interior surfaces against adsorption. Amines and organic compounds containing sulfur or hydroxyl groups are good adsorption inhibitors. Because these molecules are often surfactants, they also act to lower the surface tension between liquids and solids.
  • Aqueous corrosion is inhibited by silicates. While silicates are not truly passivators, they form visible precipitates along the walls of passages. Silicates may also inhibit corrosion via adsorption.

Many of these chemicals react more readily under specific conditions depending on temperature, pH, amount of oxygen, etc. Contact water treatment chemical supplier, Bell Chem, at (407) 339-2355 (BELL) to determine which corrosion inhibitors are best suited for your water treatment system.

Polyphosphate & Its Role in Clean Water

Water treatment facilities have long used chemicals to control unwanted organic and nonorganic material in potable water. One chemical in particular, polyphosphate, has such a variety of positive impacts on water treatment that most companies find they rely on it daily. Bell Chem has created this succinct list to explain the role water treatment chemical, polyphosphates, play on cleaning water in water treatment facilities.

  • A major role for polyphosphates is the stabilization and dispersion of iron. Surprisingly, polyphosphates do not remove iron from water; instead, the iron remains in the water in a soluble form that does not affect the color, condition, or taste of water. Chlorinating the water causes the iron to become insoluble, leading to a telltale rusty color that stains clothes, porcelain, and other porous surfaces. Adding polyphosphates before chlorination eliminates the formation of insoluble iron.
  • Manganese, another heavy metal, is also neutralized with polyphosphates. An excess of manganese leaves water looking exceedingly dark, often referred to as “black water,” which leaves brown stains on porous objects. Polyphosphates, before the addition of chlorine, will prevent manganese from becoming insoluble.
  • Water hardness is reduced when polyphosphates are present in water treatment plants.
  • Pressure tanks, hot water storage tanks, and pipes with iron deposits are scourged clean with polyphosphates. The addition of polyphosphates in these areas will temporarily increase iron in the water as it leaves the metal surfaces, but the uninterrupted use of polyphosphates retards iron from adhering to tanks and pipes within the water treatment system.
  • Magnesium and calcium crystallize in the form of scale on potable water system surfaces. Polyphosphates impede crystalline growth, leaving interior walls free of scale.

Water treatment systems have found that polyphosphates are an economical, reliable source to counter many of the daily impediments to water safety, clarity, and taste. Contact Bell Chem today at (407) 339-2355 (BELL) to speak with one of our representatives concerning polyphosphates or any other water treatment chemical, and read our past blogs for information on all the chemicals in our inventory.

Ascorbic Acid Uses Outside the Food Industry

Ascorbic acid is a singular component of vitamin C. In fact, it surrounds the other components that create the entire vitamin C complex. Science has been able to synthesize this portion of vitamin C and use its properties in many non-food industries. Water treatment chemical supplier, Bell Chem, has complied a sample of how ascorbic acid is utilized industrially.

  • Ascorbic acid acts as a preservative and reductant during photographic development.

  • Swimming pool companies use ascorbic acid to remove dissolved metal stains, namely iron, from the sides of pools. Because it is an acid, it has the ability to lower the pH of pool water and stabilize the other chemicals.

  • Iodine is another metal that ascorbic acid negates, so it is routinely added to water purification systems to remove the taste, smell, and color of iodine in sterilized water.

  • Microscopists working with fluorescent microscopy find ascorbic acid’s antioxidant ability increases the fluorescent signaling and reduces dye photobleaching in slide preparation.

  • Ascorbic acid catalyzes the assembly of molecular chains in plastic manufacturing.

  • Recent pharmaceutical trials of topical ascorbic acid have proved it reduces the appearance of fine lines and age spots significantly.  A double-blind trial had a remarkable 73.7% success rate with participants who applied an ascorbic acid solution to one side of their face and a placebo on the opposite side. Both clinicians and patients noted the improvement.

Take a second look at ascorbic acid – it’s not just for food preservation any more. Water treatment chemical supplier Bell Chem’s knowledgeable representatives would be glad to answer your questions regarding ascorbic acid, or any of their other chemicals. Call today at (407) 339-2355 (BELL) or browse our website.

Clean Water With Polyphosphates

Polyphosphates, the water treatment chemical components, play a vital role in maintaining a precise chemical level of potable (drinking) water. It is inevitable that metals exist in water; polyphosphates work to remove or reduce the level of these metals more rapidly than other chemicals; they are also used as a catalyst to stimulate other chemical reactions. For instance, hard deposits of calcium carbonate and iron oxides tend to flocculate, or clump, and cause buildups in pipes and in the water. Polyphosphates coat individual metal particles, halting flocculation and preventing clogging. Sodium hexametaphosphate interferes with early crystallization of hard metal deposits to remove these metals from the water at levels far below what is typical for other reactions. Polyphosphates also act as sequestration agents, surrounding metal ions such as iron and manganese to form soluble chemical complexes that move through pipes rather than adhering to them.

Many water treatment chemicals have a specific pH range and strict environmental protocol to work properly. Polyphosphate configuration is varied and works in a wide range of neutral or alkaline pH levels. Polyphosphates are stable under conditions considered too harsh for other water treatment chemicals, such as those found in chlorinated drinking water. Stability is also important in storing chemicals, and polyphosphates have the ability to retain physical and chemical properties over an extended period of time.

If you are looking for an array of stable, hard-working water treatment chemicals to quickly improve your water treatment system, give polyphosphates a try. For the most reliable water treatment chemical supplier in the Orlando area, contact Bell Chem today. By simply calling 407-339-BELL(2355), you’ll be establishing a lasting and reliable relationship, unlike any other. Along with a vast selection of water treatment chemicals, we also have various pharmaceutical and personal care, as well as raw materials to suit any need or desire.