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Why Do Pools Need Flocculants


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When faced with soluble impurities, we can flocculate and precipitate them by adding a flocculant.

How does the pool flocculant flocculate the dissolvable debris?

At specific intervals, the swimming pool needs to add flocculant to allow the suspended matter in the pool to sink to the bottom of the pool, followed by pool suction, which is crucial for maintaining cleanliness. Many surfaces of soluble debris carry a charge, making them stable in water and less prone to settling. Flocculants contain substances with opposite charges that can compress and neutralize the charge of these impurities. This causes them to lose stability, fuse with each other, and precipitate out. Some flocculants can also directly adsorb such debris. The suspended material in the pool is generally soluble, but many of its surfaces have an electric charge (ZETA potential), which makes it very stable in the water and cannot settle. After adding the flocculant, the substances with opposite charges in the flocculant can compress and neutralize the potential of the suspended substances, so that they lose stability, collide and fuse with each other, and thus settle. Some flocculants can directly adsorb suspended substances, and polymer flocculants can also bridge small suspended particles directly.

The importance of swimming pool flocculants

In the process of swimming pool water treatment, the circulating filtration system can not filter out the small particles in the pool, at this time, we need to use the pool water treatment flocculant to flocculate and precipitate the small debris in the pool water, and then suck the dirt on the bottom of the pool. Swimming pool water treatment flocculation plays a key role in the process of swimming pool cleaning. Water treatment flocculant is also known as water treatment precipitant, water treatment coagulant. The common water treatment flocculant used in swimming pools is an inorganic flocculant – polyaluminum chloride. As a flocculant for swimming pool water treatment, polyaluminum chloride exists in colloidal form when purifying water, and has a large specific surface and adsorption capacity, which can precipitate many anti-charge colloidal particles in water from water, and then play a purification role. Of course, the formation of colloidal particles is also based on a certain degree of hydrolytic polymerization of polyaluminum chloride.

How to use polyaluminium chloride to flocculate a swimming pool

  1. Water treatment flocculant dosage time: Generally arranged at the end of the evening when the pool water flocculation, and then the need for static precipitation time is generally not less than 6 hours, and then the pool suction.
  2. pH control: The appropriate PH range of polyaluminum chloride is 7.5-8.5, in the alkaline environment, it can give full play to its hydroxyl bridging effect, accelerate the coagulation sedimentation, so before adding flocculant should first check and adjust the PH value of the pool water.
  3. Dosage: Calculated based on the total volume of the pool for each application. The reagent’s dosage in the pool water should achieve a flocculant concentration of 5-10mg/L. Depending on the pollution of the swimming pool, the flocculant can be added 1-2 times a week.
  4. Dosage: According to the amount of 5-10KG per 1000 cubic meters of water. When used, the proportion of solid polyaluminum chloride 1 part: water 3 parts is mixed and dissolved first, and then diluted with water to 2-3% of the solution can be spilled into the swimming pool for use.

Finally, pay attention to the rainy weather do not add water treatment flocculant, because the water can not be static, will affect the flocculation effect,

Advantages of using polyaluminium chloride to flocculate swimming pools

  • The purified water quality is better than the aluminum sulfate flocculant, and the water purification cost is 15-30% lower than that.
  • The flocculant formation is fast, the sedimentation rate is fast, and the processing capacity is larger than that of traditional products such as aluminum sulfate.
  • The salt in the treated water increases less, which is conducive to ion exchange treatment and high purity water preparation.
  • The adaptability to the temperature of the source water is better than that of inorganic flocculants such as aluminum sulfate.
  • The alkalinity of the consumption water is lower than that of various inorganic flocculants, so you may not cast or less alkali agent.
  • The adaptive source water PH5.0-9.0 range can be condensed.
  • Small corrosion, good operating conditions.
  • Solubility is better than aluminum sulfate.

Flocculant use precautions

  1. According to the dosage of 5 to 8 grams per cubic meter of water (that is, 1000 cubic meters of 5 to 8 kilograms).
  2. Prepare a solution with a ratio of 1:3 to water before delivery, and dilute it with water after 10 minutes.
  3. The PH value of the water must be adjusted to 7.5-7.8 before putting.
  4. Half an hour after the water circulation is uniform polyaluminum chloride, 6-8 hours after precipitation and then suction operation.
  5. Pay attention to the rainy day do not put flocculant

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