Reverse osmosis scale inhibitors are typically sold as standard solutions or concentrated forms (such as 4x, 8x, or 11x concentrates). This approach was initially adopted to reduce packaging and shipping costs. By increasing the concentration, importers or distributors can dilute the product before resale, making it more cost-effective for end users.
The recommended dosage of reverse osmosis antiscalants is generally between 3 to 6 ppm, which means adding 3 to 6 grams of the chemical per ton of water processed. To calculate the monthly consumption, you can use the formula:
**W = Q × S × H × 30 / 1000**, where:
- **W** is the monthly dosage in kilograms (Kg),
- **Q** is the influent flow rate in cubic meters per hour (m³/h),
- **S** is the dosage concentration in ppm (or g/ton),
- **H** is the operating hours per day,
- **30** represents the number of days in a month,
- **1000** is used to convert grams to kilograms.
For example, if a reverse osmosis system produces 75 tons of water per hour, the feed water must be at least 100 tons per hour. Assuming a dosage of 3.5 ppm, the monthly usage would be:
**100 × 3.5 × 24 × 30 / 1000 = 252 kg**.
When adding scale inhibitors, they are usually introduced into the system through a dosing pump, typically after the security filter or precision filter. The chemical can be added directly or diluted with water, but the dilution ratio should not exceed 10 times, meaning the concentration should remain above 10%.
Important considerations when using reverse osmosis antiscalants include:
- Ensure the dosing system is clean and sealed before each use.
- It's best to use the chemical within its recommended shelf life for optimal performance.
- Always dilute with purified or deionized water to avoid contamination.
Proper handling and accurate dosing are essential to maintain the efficiency and longevity of your reverse osmosis system. Regular monitoring and maintenance will help prevent scaling and ensure consistent water quality.
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