🏊 Waterco 1400 SPDD Commercial Bobbin Wound Filter Tank – 4 Bar, Air Scour Nozzle Plate System

First 4-inch connection model in the SPDD range – 35% more flow than SPDD 1200 with upgraded pipework capacity

💧 Product Overview

The Waterco 1400 SPDD Commercial Bobbin Wound Filter Tank marks the step up to 4-inch (110mm) connections in the SPDD air scour range, delivering substantially increased flow capacity for larger commercial pools and aquatic facilities. With a 1400mm tank diameter and 1.54 m² filter area, this filter provides an impressive 46 m³/hr flow rate – representing a 35% increase over the SPDD 1200 while introducing the enhanced flow capability of 4-inch pipework.

The innovative Air Scour Nozzle Plate System introduces pressurised air directly into the 2,640 kg media bed, reducing backwash water consumption by up to 25% while achieving superior media cleaning through vigorous air/water agitation. For high-volume commercial operations where water costs and environmental compliance are critical, the SPDD 1400 delivers measurable operational savings alongside exceptional filtration performance.

Built using Waterco’s precision digitally-controlled filament winding technology, this commercial filter tank features seamless bobbin-wound fibreglass construction engineered for decades of reliable service. The 1200mm deep media bed provides exceptional particle capture, while manhole access ensures easy inspection and maintenance of the air scour system. Supplied as tank only with 4 bar pressure rating.

⭐ Key Features

✅ 110mm / 4″ Flange Connections – First SPDD model with upgraded 4-inch pipework capacity

✅ Air Scour Nozzle Plate System – Pressurised air injection for superior backwash efficiency

✅ Up to 25% Less Backwash Water – Significant water and chemical savings for commercial operations

✅ 1400mm Tank Diameter – High-capacity filtration for pools up to 368,000 litres

✅ 1.54 m² Filter Area – 35% more capacity than SPDD 1200 for demanding applications

✅ 46 m³/hr Flow Rate – High-volume filtration for busy commercial and municipal pools

✅ 1200mm Deep Media Bed – Superior in-depth particle capture and extended filter runs

✅ 2,640 kg Sand Capacity – Over 2.5 tonnes of media for exceptional dirt-holding

✅ Manhole Access – Easy inspection and maintenance access to nozzle plate system

✅ Advanced Bobbin Wound Construction – Seamless fibreglass vessel with exceptional durability

✅ 4 Bar Pressure Rating – Engineered for demanding commercial system pressures

✅ Corrosion & UV Resistant – Premium fibreglass withstands chemicals and outdoor exposure

⚙️ Technical Specifications

Specification	Value
Model	SPDD 1400
Filter Type	Commercial Sand/Media Filter with Air Scour (Tank Only)
Tank Diameter	1400 mm
Filter Bed Depth	1200 mm
Filter Area	1.54 m²
Flow Rate	46 m³/hr (at 30 m³/hr/m²)
Working Pressure	4 Bar (58 psi)
Maximum Working Temperature	50°C
Connection Size	4″ / 110 mm (Flange)
Sand Media Capacity	2,640 kg
Glass Media Capacity	2,170 kg
Gravel Capacity	396 kg (if using support layer)
Tank Height (Overall)	2313 mm
Tank Width	1442 mm
Empty Weight	399 kg
Tank Material	Fibreglass Reinforced Polyester (Bobbin Wound)
Lateral System	Nozzle Plate with Air Scour
Access	Manhole for inspection and maintenance
Warranty	10 years tank (5 years full + 5 years pro rata), 1 year components

📐 Pool Sizing Guide

Sizing Principle:

The filter’s flow rate should achieve complete pool water turnover within the required timeframe. Commercial pools typically require 6-hour turnover rates for optimal water quality, with 8-hour turnover acceptable for lower-demand applications.

Formula:

Required Flow Rate (m³/h) = Pool Volume (m³) ÷ Turnover Time (hours)

Pool Capacity Compatibility:

Application	Turnover Time	Maximum Pool Volume
🏨 Large Hotel/Resort Pool	6 hours	276,000 litres
🏢 Municipal Pool	6 hours	276,000 litres
🏫 Large School Pool	6 hours	276,000 litres
🏊 Competition Training Pool	6 hours	276,000 litres
🏋️ Large Leisure Centre	6-8 hours	276,000-368,000 litres

This Filter:

📍 Flow Rate: 46 m³/hr at design velocity
📍 Optimal Pool Size: Up to 276,000 litres (6-hour turnover)
📍 Maximum Pool Size: Up to 368,000 litres (8-hour turnover)

💡 Upgrade Note: The SPDD 1400 is the first model with 4-inch connections, offering 35% more flow than the SPDD 1200 (34 m³/hr). This requires upgraded 4-inch pipework but delivers significantly enhanced capacity for larger facilities.

🔌 Installation Requirements

Plumbing Specifications

Requirement	Specification
Inlet Connection	110 mm / 4″ Flange
Outlet Connection	110 mm / 4″ Flange
Connection Type	Flange
Filter Configuration	Side Mount
Air Scour Connection	Required for nozzle plate operation

Physical Installation

Requirement	Details
Base	Reinforced concrete pad required
Clearance Above	Minimum 700 mm for manhole access and media maintenance
Clearance Around	Minimum 800 mm for valve operation and air scour connections
Access	Manhole provides direct access to nozzle plate system
Lifting Equipment	Required – 399 kg empty weight
Floor Loading	Verify capacity (filled weight approximately 3,100 kg)

Pump & Air Scour Compatibility

⚠️ Important: This filter requires both pump and air blower connections for full functionality.

Pump Requirements:

• Recommended flow rate: 38 – 46 m³/hr
• Maximum flow rate: Do not exceed 46 m³/hr
• Connection: 110mm / 4″ to match filter flanges

Air Scour Requirements:

• Compatible air blower for pressurised air injection
• Appropriate pipework to nozzle plate connection
• Higher capacity blower than 3″ models due to larger bed area

💡 Note: This is a tank-only product. Multiport valves, face pipework kits, air blowers, and pumps are sold separately. Contact Parts4Tubs for 4-inch compatible valve and pipework options.

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🧹 Maintenance Guide

Air Scour Backwash Procedure

The SPDD’s nozzle plate system enables a highly efficient two-stage backwash:

Stage 1 – Air Scour:

1. Set multiport valve to backwash position
2. Activate air blower (pump off)
3. Allow air to agitate media bed for 3-4 minutes (longer due to larger bed)
4. Air breaks up compacted media and dislodges trapped debris

Stage 2 – Water Backwash:

1. Switch off air blower
2. Activate pump for water backwash
3. Continue until sight glass runs clear
4. Total backwash time significantly reduced vs conventional filters

Routine Maintenance Schedule

Task	Frequency	Procedure
Check pressure gauge	Weekly	Record baseline and monitor for increases
Visual inspection	Weekly	Check for leaks, unusual sounds, pressure anomalies
Air scour backwash	When pressure rises 0.5-0.7 bar above baseline	Follow two-stage procedure above
Rinse after backwash	After each backwash	30-60 seconds to settle media
Inspect manhole seal	Quarterly	Check for wear, replace if necessary
Check nozzle plate	Annually	Inspect via manhole for damage or blockages
Full media replacement	Every 5-7 years (sand) or 10+ years (glass)	Replace completely

Pressure Gauge Guide

📊 Clean Filter Baseline: Establish after fresh media installation
📊 Backwash Trigger: 0.5-0.7 bar above baseline
📊 Maximum Operating Pressure: 4 bar

Water Savings Calculation

With up to 25% reduction in backwash water:

Conventional Backwash	SPDD Air Scour Backwash	Annual Savings*
4,000 L per cycle	3,000 L per cycle	52,000 L/year
5,000 L per cycle	3,750 L per cycle	65,000 L/year
6,000 L per cycle	4,500 L per cycle	78,000 L/year

*Based on weekly backwash frequency

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🪨 Filter Media Information

Compatible Media Types

Media Type	Filtration Rating	Capacity Required	Lifespan	Key Benefits
Silica Sand	20-40 microns	2,640 kg	5-7 years	Economical, proven performance
Glass Media	5-15 microns	2,170 kg	10+ years	Finer filtration, longer life
ZeoSand/Zeolite	3-5 microns	As specified	5 years	Superior clarity, ammonia removal
AFM (Activated Filter Media)	1-5 microns	As specified	10+ years	Bio-resistant, self-sterilising

Standard Media Configuration:

• Sand Capacity: 2,640 kg (over 2.5 tonnes of 16/30 grade silica sand)
• Glass Media Capacity: 2,170 kg
• Support Gravel: 396 kg (deduct from sand capacity if used)

💡 Commercial Recommendation: With 2,640 kg media capacity, glass media offers exceptional long-term value – finer filtration (5-15 microns vs 20-40 for sand) with 10+ year lifespan justifies the higher initial investment.

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🔬 Filtration Performance

Metric	Value
Filter Area	1.54 m²
Design Flow Rate	46 m³/hr
Design Velocity	30 m³/hr/m²
Bed Depth	1200 mm (deep bed design)
Backwash Efficiency	Up to 25% water reduction

Air Scour Technology Advantage

The SPDD’s nozzle plate system delivers superior backwash performance:

• Uniform Air Distribution: Pressurised air introduced evenly across entire 1.54 m² filter bed
• Vigorous Agitation: Air bubbles break up compacted media and dislodge trapped particles
• Optimal Bed Expansion: Consistent media fluidisation throughout backwash cycle
• Faster Cleaning: Reduced backwash duration saves time and labour
• Water Conservation: Up to 25% less backwash water consumption
• Better Media Cleaning: More thorough debris removal extends media life

Capacity Comparison: SPDD 1400 vs SPDD 1200

Specification	SPDD 1200	SPDD 1400	Increase
Filter Area	1.13 m²	1.54 m²	+36%
Flow Rate	34 m³/hr	46 m³/hr	+35%
Sand Capacity	1,930 kg	2,640 kg	+37%
Pool Capacity (6hr)	204,000 L	276,000 L	+35%
Connection Size	90mm/3″	110mm/4″	Upgraded

🔧 Valve Positions & Functions

Note: Multiport valve sold separately – 4″ rated valve required

Position	Function
Filter	Normal filtration mode – water flows through media bed
Backwash	Reverse flow with air scour – superior media cleaning
Rinse	Settles media after backwash – brief forward flow to waste
Waste	Bypass filter – pump directly to drain
Recirculate	Bypass filter – return to pool without filtration
Closed	Stop all flow – isolate filter from system

🎯 Ideal Applications

Application	Suitability	Notes
🏨 Large Hotel & Resort Pools	✅ Excellent	High capacity with water-saving air scour
🏢 Municipal Swimming Pools	✅ Excellent	Reduced operating costs for public facilities
🏫 Large School & College Pools	✅ Excellent	Water savings meet environmental targets
🏊 Competition Training Pools	✅ Excellent	Superior water clarity for athletic facilities
🏋️ Major Leisure Centres	✅ Excellent	Handles high bather loads efficiently
🌍 Water-Conscious Installations	✅ Ideal	Up to 25% backwash water savings

❓ Frequently Asked Questions

Q: What size pool will this filter handle?

A: The SPDD 1400 is suitable for pools up to 276,000 litres with a 6-hour turnover, or up to 368,000 litres with an 8-hour turnover.

Q: Why does this model have 4-inch connections?

A: The SPDD 1400 is the first model in the SPDD range to upgrade from 3-inch to 4-inch (110mm) connections. The larger pipework is required to handle the 46 m³/hr flow rate efficiently, reducing pipe friction losses and enabling optimal pump performance.

Q: How does this compare to the SPDD 1200?

A: The SPDD 1400 offers 35% more flow rate (46 m³/hr vs 34 m³/hr), 36% more filter area (1.54 m² vs 1.13 m²), and 37% more media capacity (2,640 kg vs 1,930 kg). The upgrade to 4-inch connections provides the enhanced flow capacity needed for larger commercial pools.

Q: Can I use my existing 3-inch pipework?

A: No, the SPDD 1400 requires 4-inch (110mm) pipework throughout. If upgrading from a 3-inch system, you’ll need to upgrade valves, pipework, and potentially pumps. Contact Parts4Tubs for guidance on system upgrades.

Q: How much media does this filter require?

A: The filter requires 2,640 kg of sand (over 2.5 tonnes) or 2,170 kg of glass media – substantial capacity for excellent dirt-holding in high-demand commercial applications.

Q: Do I need additional equipment for the air scour system?

A: Yes, you’ll need a compatible air blower and appropriate pipework to connect to the nozzle plate system. The larger filter area requires a higher-capacity blower than 3-inch models.

Q: What’s the total weight when filled?

A: Empty weight is 399 kg. With 2,640 kg of sand media, total filled weight is approximately 3,100 kg (over 3 tonnes). Ensure your plant room floor can support this substantial load.

Q: What warranty is included?

A: Waterco provides a 10-year tank warranty (5 years full cover plus 5 years pro rata) and 1-year warranty on components.

📥 Downloads & Resources

📄 SPDD Technical Datasheet – Full specifications and dimensions for all SPDD models

🏆 Why Choose the Waterco 1400 SPDD

✅ First 4″ SPDD Model – Upgraded connections for enhanced flow capacity

✅ 35% More Flow – Significant upgrade from SPDD 1200 for larger pools

✅ Air Scour Technology – Up to 25% less backwash water than conventional filters

✅ Over 2.5 Tonnes Media – 2,640 kg sand capacity for exceptional dirt-holding

✅ Reduced Operating Costs – Water and chemical savings accumulate over time

✅ Deep Bed Filtration – 1200mm media depth for exceptional water clarity

✅ Commercial-Grade Construction – Bobbin wound fibreglass for decades of service

✅ Comprehensive Warranty – 10-year tank warranty provides peace of mind

🤝 Why Buy from Parts4Tubs

✅ UK-Based Company – Local support and expertise from pool industry specialists

✅ Fast UK Delivery – Efficient dispatch on commercial equipment orders

✅ Expert Technical Advice – Get sizing recommendations and system design guidance

✅ Competitive Pricing – Commercial-grade equipment at excellent value

✅ Full Warranty Support – We handle warranty claims directly with manufacturers

✅ Complete System Components – 4″ valves, pipework, air blowers, and media available

✅ Easy Returns – 30-day returns on eligible products

✨ Summary

The Waterco 1400 SPDD Commercial Bobbin Wound Filter Tank is the first 4-inch connection model in the SPDD air scour range, delivering 46 m³/hr flow rate and 1.54 m² filter area for commercial pools up to 276,000 litres (6-hour turnover). The upgraded 110mm (4-inch) connections provide 35% more capacity than the SPDD 1200 while the innovative nozzle plate air scour system reduces backwash water by up to 25%, delivering significant operational savings for municipal pools, large hotels, leisure centres, and competition facilities. The substantial 2,640 kg sand capacity (over 2.5 tonnes) and 1200mm deep bed ensure exceptional dirt-holding and water clarity. Manhole access provides easy inspection of the air scour system. Advanced bobbin-wound fibreglass construction delivers decades of reliable commercial service. Supplied as tank only with 4 bar pressure rating. Backed by Waterco’s comprehensive 10-year tank warranty.