Green Tank Solutions
Sustainable water storage, rainwater harvesting, and greywater recycling systems for Hong Kong's built environment
Water-Smart Solutions for Modern Buildings
Perfect Engineers Limited's Green Tank Solutions division specialises in the design, supply, installation, and maintenance of sustainable water storage and management systems. We help building owners and developers reduce water consumption, lower operating costs, and achieve green building certifications.
From potable water tanks and fire-fighting reserves to rainwater harvesting and greywater recycling, our integrated approach covers the full water cycle within the built environment — compliant with Hong Kong Water Supplies Department requirements and international sustainability standards.
25+ Years
Experience
500+
Tank Projects
Why Choose Green Tank Solutions
- WSD-approved designs and materials
- BEAM Plus & LEED compliance support
- In-house PE-stamped structural drawings
- Full turnkey from design to commissioning
- Modular GRP panel tank systems
- Smart BMS-integrated controls
- Annual maintenance programmes
- Emergency repair 24/7 response
Our Capabilities
Comprehensive water tank and sustainable water management services
Water Storage Tank Design
Custom design of potable water, fire-fighting, and process water storage tanks for commercial, residential, and industrial buildings.
Rainwater Harvesting Systems
End-to-end design and installation of rainwater collection, filtration, and reuse systems to reduce mains water consumption.
Greywater Recycling
Greywater treatment and recycling systems for toilet flushing and irrigation, reducing building water demand by up to 40%.
Tank Lining & Remediation
Inspection, cleaning, relining, and structural repair of existing concrete and steel water tanks to extend service life.
Pressure & Pumping Systems
Variable-speed booster pump sets, pressure vessels, and intelligent control systems for efficient water distribution.
Water Quality Management
UV disinfection, filtration, and chemical dosing systems ensuring water quality compliance with Hong Kong WSD standards.
Technical Specifications
Industry-leading standards for sustainable water system design and installation
Tank Materials
GRP (glass-reinforced plastic), stainless steel 304/316L, HDPE, and reinforced concrete
Capacity Range
From 5,000 litres to 5,000,000 litres; modular panel systems for flexible sizing
Water Quality Standards
WSD-compliant potable water systems; WHO guidelines for water quality
Rainwater Harvesting
First-flush diverters, multi-stage filtration, UV sterilisation, and storage management
Pumping Systems
Variable frequency drives (VFD), duty/standby configurations, BMS integration
Sustainability Certifications
BEAM Plus, LEED, and WELL Building Standard compliance support
Structural Design
Seismic-resistant designs per Hong Kong structural codes; PE-stamped drawings
Maintenance Contracts
Annual inspection, cleaning, and water quality testing programmes available
Our Process
A structured approach from initial assessment to long-term maintenance
Site Assessment & Audit
Detailed survey of existing water systems, demand analysis, and identification of water-saving opportunities.
System Design
Engineering design of tank sizing, materials selection, pumping, filtration, and control systems with full calculations.
Regulatory Approval
Submission to Water Supplies Department and Buildings Department; liaison with authorities for approvals.
Fabrication & Procurement
Factory fabrication of GRP or steel tanks; procurement of pumps, controls, and ancillary equipment.
Installation & Commissioning
Site installation, pipework connections, electrical integration, and full system commissioning with water quality testing.
Handover & Maintenance
O&M manual preparation, operator training, and ongoing maintenance programme to ensure long-term performance.
Featured Projects
Successful Green Tank Solutions projects across Hong Kong
Commercial Tower Rainwater Harvesting
Design and installation of a 500,000-litre rainwater harvesting system for a Grade A office tower in Kowloon, achieving 35% reduction in mains water consumption.
Residential Estate Water Tank Remediation
Full inspection, cleaning, and GRP relining of 24 rooftop water tanks across a 3,000-unit residential estate in the New Territories.
Industrial Greywater Recycling Plant
Greywater treatment and recycling system for a large-scale manufacturing facility, processing 800 m³/day and reducing discharge costs significantly.
Ready to Go Green with Your Water Systems?
Contact our Green Tank Solutions team for a free water audit and discover how much you can save on water costs while achieving your sustainability goals.