Use these calculators to size a commercial or industrial RO system, estimate product water quality, and calculate operating costs before you talk to a supplier.
1. RO System Sizing Calculator — What GPD Do I Need?
Enter your daily water consumption by use category. The calculator adds 20% capacity buffer and recommends a system size.
2. Product Water TDS Calculator — What Will My Output TDS Be?
Estimate permeate TDS based on feed water TDS and membrane rejection rate.
3. Membrane Element Count Calculator
Estimate the number of 4040 or 8040 membrane elements required for your target flow rate.
4. RO System Energy Cost Calculator
Estimate daily and annual electricity cost for your RO system pump.
5. System Recovery and Concentrate TDS Calculator
Calculate your actual recovery rate and the TDS concentration in the reject (concentrate) stream — important for scaling risk and concentrate disposal planning.
How to Use These Results
These calculators use standard RO engineering assumptions. Real-world performance depends on your actual feed water chemistry, system operating conditions, and membrane brand. Use the numbers here as a starting point for conversations with your RO supplier — not as a substitute for a site-specific engineering review.
Key variables that affect actual performance beyond what these calculators model:
- Feed water hardness and scaling potential: High LSI (Langelier Saturation Index) water requires antiscalant dosing or softening pre-treatment to protect membranes.
- SDI (Silt Density Index): SDI above 5 in the RO feed causes rapid fouling. Pre-filtration must be sized to bring SDI below 5.
- Chlorine and oxidants: Polyamide membranes are chlorine-sensitive. Any chlorinated supply requires carbon pre-filtration.
- Feed pressure availability: Low supply pressure reduces pump efficiency and system output.
Get a System Recommendation Based on Your Numbers
Tell AMPAC USA's engineering team your calculated GPD requirement, feed water TDS, and application. We'll recommend the right system and pre-treatment configuration — and give you a factory-tested quote. Made in USA. 2-year warranty.