Swamp coolers, also known as evaporative coolers, are a popular and energy-efficient way to cool homes, especially in dry climates. However, when using soft water in these coolers, homeowners may encounter mineral scale buildup, which can reduce the efficiency and lifespan of the unit. Fortunately, there is a simple solution to this problem: sodium hexametaphosphate.
Sodium Hexametaphosphate: The Key to Soft Water Swamp Coolers
Sodium hexametaphosphate is a white, granular powder that can be easily dissolved in the water of a swamp cooler’s pan. This compound is highly effective in reducing mineral scale caused by hard water, and it can also be used to prevent scale buildup in other water-using appliances, such as showerheads, pots, and toilets.
Technical Specifications of Sodium Hexametaphosphate
- Chemical Formula: (NaPO3)6
- Appearance: White, granular powder
- Solubility: Readily soluble in water
- Dosage: Dissolve 1/2 cup (120 ml) of sodium hexametaphosphate in the cooler pan of water
Sodium hexametaphosphate works by sequestering the calcium and magnesium ions present in hard water, preventing them from forming mineral scale deposits. This helps to keep the swamp cooler’s pads, pump, and other components free from scale buildup, which can improve the unit’s efficiency and extend its lifespan.
Benefits of Using Soft Water in Swamp Coolers
While soft water contains a small amount of sodium, this concentration is not high enough to cause significant rusting or other issues in a swamp cooler. In fact, using soft water in a swamp cooler offers several advantages over hard water:
- Reduced Scale Buildup: Soft water contains fewer dissolved minerals, which means less scale buildup on the cooler’s pads and other components.
- Improved Pump Performance: Soft water is less abrasive, which can help to extend the life of the cooler’s pump and reduce maintenance needs.
- Decreased Biofilm and Algae Growth: Soft water is less prone to supporting the growth of biofilm and algae, which can clog the cooler’s water lines and pads.
- Easier Maintenance: With less scale buildup and reduced biofilm/algae growth, swamp coolers using soft water require less frequent cleaning and maintenance.
Precautions When Using Soft Water in Swamp Coolers
While soft water is generally safe for use in swamp coolers, it’s important to take a few precautions:
- Avoid Connecting Soft Water Equipment Directly: Attaching soft water equipment, such as a water softener, directly to the swamp cooler’s water line can lead to corrosion and decrease the effective life of the cooler. Instead, use a bleeder pipe to run off excess water from the unit.
- Monitor for Sodium Buildup: Although the sodium concentration in soft water is low, it’s still a good idea to monitor the cooler for any signs of sodium buildup, such as white deposits or rust.
- Maintain the Cooler Regularly: Regardless of the water source, it’s essential to clean and maintain the swamp cooler regularly to ensure optimal performance and longevity.
DIY Instructions for Using Sodium Hexametaphosphate in Swamp Coolers
- Purchase Sodium Hexametaphosphate: Obtain sodium hexametaphosphate from a chemical supply house or online retailer. Look for a high-quality, food-grade product.
- Dissolve the Powder: Measure out 1/2 cup (120 ml) of sodium hexametaphosphate and dissolve it in the cooler pan of water.
- Monitor and Adjust as Needed: Check the cooler regularly and add more sodium hexametaphosphate as needed to maintain the desired level of scale prevention.
By following these steps, you can effectively use soft water in your swamp cooler while preventing mineral scale buildup and enjoying the benefits of reduced maintenance and improved performance.
References
- Use Softened Water for Swamp Coolers – Affordable Water Treatment. (2018-04-30). Retrieved from https://www.affordablewatertreatment.info/safe-use-softened-water-swamp-coolers/
- Can soft water be used with the evaporative cooler? – Phoenix Manufacturing. Retrieved from https://phoenixmanufacturing.com/can-soft-water-be-used-with-the-evaporative-cooler/
- Debate: hard or soft water for evaporative cooler : r/Plumbing – Reddit. (2018-05-25). Retrieved from https://www.reddit.com/r/Plumbing/comments/8m2o40/debate_hard_or_soft_water_for_evaporative_cooler/
- Swamp Cooler and Softened Water – WaterTech. (n.d.). Retrieved from https://blog.watertech.com/swamp-cooler-and-softened-water/
- Evaporative Cooler tricks | The Garage Journal. (2011-04-04). Retrieved from https://www.garagejournal.com/forum/threads/evaporative-cooler-tricks.97754/