Express Drainage Solutions

A Solution for Sanitation, Wastewater Treatment & Renewable Energy

Njengi House

2nd Floor Suite 6, Tom Mboya St.

8:00AM - 5:00PM

Monday to Friday



If you want your boiler to remain in good condition and be as efficient as possible, the water must remain free from impurities, which means that water treatment will be necessary. There are two methods that Express Drainage Solutions Limited uses for the treatment of boiler water, which include external treatment and internal treatment. Both of these processes rely on the conditioning process, which essentially counteracts the hardness in water by introducing softening agents to the water. Once these agents have been placed in the water, most of the minerals, contaminants, and chemicals within the water should be altered or removed completely. No matter which of these methods you use, there are many effective chemicals that you can use to keep the water free from impurities, which include everything from oxygen scavengers to anti-scaling agents.

The following are the more common chemicals Express Drainage Solutions Limited supplies that are used in boiler water treatment.

Oxygen Scavengers

Oxygen scavengers are designed specifically to reduce the amount of dissolved oxygen and oxides in the water. If you use a DO sensor and find that the amount of dissolved oxygen in your boiler water is too high, oxygen scavengers like hydrazine and sodium sulphite can effectively reduce both DO and oxides for purer water. Oxygen scavengers will typically passivate various metal surfaces as well, which helps to keep rust and other issues at bay.

When you introduce a chemical oxygen scavenger to your boiler water, you’ll be able to remove any residual oxygen from the feed water, protect the boiler from harmful chemical reactions, and reduce corrosion within the feed tank and return lines. Tannin chemicals and sulphite chemicals have proven to be particularly effective oxygen scavengers. If you decide to use sodium sulphite, this oxygen scavenger will act quickly and is particularly beneficial for low-pressure applications. As for tannin, this chemical will remove oxygen from the water while also creating a corrosion resistant-film around the steel of the boiler.

Alkalinity Builders

Alkalinity builders are designed specifically to raise the pH level of the water that they are placed in. For steam boilers, pH levels must remain high to prevent corrosion, minimize the amount of silica plating in a high-pressure boiler, and maintain proper efficiency of the boiler.

The most common alkaline solutions for boiler water include sodium hydroxide and potassium hydroxide. You can typically purchase these products with a 25 percent concentration or a 50 percent concentration. If you need to significantly increase the amount of alkalinity in your feed water, a 50 percent solution could be the most effective option for you. Some alkalinity builders come with sludge conditioning polymers, which are notably beneficial for high-temperature applications.


Amines are neutralizing chemicals that are able to keep the condensate pipe on a boiler from corroding. Condensate water from a steam boiler can be highly corrosive to piping, which can damage your boiler and cause you to make expensive repairs to fix the issue. The three types of neutralizing amines that we supply for boiler water treatment purposes include morpholine, dimethylaminoethanol, and cyclohexylamine. While it’s possible to purchase these neutralizing amines as a singular component, the majority of solutions will be blended with all three.

When these amines are placed into your boiler water, they will increase the condensate pH, which heavily reduces the possibility of corrosion. Low pH within condensate piping is known to cause high amounts of corrosion, which can lead to both condensate leaks and steam leaks. Once this chemical has been applied to the water in your boiler, you’ll be provided with increased boiler reliability, cleanliness, and protection. While the condensate piping is the main area of focus, this chemical will protect all condensate systems. In order to determine if this chemical is needed, it’s recommended that you use a pH sensor to test the return condensate.

Agents Anti-Scaling

Anti-scaling agents are used to enhance the dispersive properties of any conditioning products that are being used in your boiler water. An anti-scaling agent is typically comprised of a blend of polymers and phosphates. These anti-scaling agents are available as either natural or synthetic chemicals. The most common natural polymers include tannins and lignosulphonates, while the synthetic polymers available include polystyrene sulphonates and maleic acrylate copolymers.

These chemicals act as softening agents in order to minimize the buildup of scale in your boiler. Scaling can be a significant problem for boilers because of how it causes the boiler to be much less efficient. When harder impurities like magnesium salt and calcium start to increase in your boiler water, they will eventually become concentrated, which means that they will adhere to the tubes and other surfaces in your boiler.

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P.O.BOX 8620-00200, Nairobi, Kenya

Njengi House, 2nd Floor Suite 6, Tom Mboya St.