💦 AstralPool Millennium 430mm Top Mount Sand Filter with Valve – 40,000 Litre Capacity

Powerful filtration technology for sparkling clean water all season long

📋 Product Overview

The AstralPool Millennium 430mm Top Mount Filter delivers outstanding filtration performance for residential pools up to 40,000 litres. This premium sand filter features AstralPool’s innovative one-piece blow-moulded construction, eliminating joints and welds that can become potential leak points over time.

Engineered for the demands of private in-ground and above-ground pools, this filter provides a generous 7 m³/h flow rate through its integrated 6+1 position multiport valve. The corrosion-resistant ivory-coloured tank withstands chemical exposure and outdoor weather conditions, making it ideal for permanent installation in UK gardens. The bayonet-closure valve system ensures reliable operation across all filtration functions, including a dedicated winterisation position essential for British pool owners.

Compatible with sand, glass, or zeolite filter media (sold separately), the Millennium 430mm offers flexibility to choose your preferred filtration approach. The sleek modern design complements any pool equipment setup whilst delivering the professional-grade performance AstralPool is renowned for.

🌟 Key Features

✅ One-Piece Blow-Moulded Tank – Seamless construction eliminates joints and potential leak points for long-term reliability

✅ 7 m³/h Flow Rate – Robust filtration capacity handles pools up to 40,000 litres with optimal turnover

✅ 6+1 Position Multiport Valve Included – Complete control with filter, backwash, rinse, recirculate, waste, close, and winter settings

✅ 60 kg Media Capacity – Generous filter bed depth for thorough particle capture and extended filter runs

✅ 2.5 Bar Working Pressure – Heavy-duty construction handles demanding residential filtration requirements

✅ Integrated Pressure Gauge – Valve-mounted gauge allows easy monitoring of filter condition

✅ Manual Air and Water Bleeds – Built-in purge valves simplify maintenance and winterisation

✅ 1½” Connections – Standard sizing ensures compatibility with most residential pool plumbing

✅ Sand and Glass Compatible – Choose traditional sand or upgrade to glass media for finer filtration

✅ EN 16713-1 Compliant – Meets European standards for residential pool filtration equipment

✅ 2-Year Manufacturer Warranty – AstralPool quality backed by comprehensive guarantee

📊 Technical Specifications

Specification	Value
Filter Type	Sand/Glass Media (Top Mount)
Model Number	22407
Pool Capacity	Up to 40,000 litres (40 m³)
Flow Rate	7 m³/h (7,000 l/h)
Filtration Rate	50 m³/h/m²
Tank Diameter	430 mm
Overall Height (H)	875 mm
Height to Connections (M)	735 mm
Height to Tank Base (N)	655 mm
Media Capacity (Sand)	60 kg
Media Capacity (Glass)	48 kg
Working Pressure	2.5 bar (2.5 kg/cm²)
Inlet/Outlet Size	1½” (38 mm)
Tank Material	Blow-moulded corrosion-resistant plastic
Tank Colour	Ivory/Beige
Valve Type	6+1 Position Multiport with Bayonet Closure
Weight (Empty)	14 kg
Certifications	EN 16713-1
Warranty	2 years

⚠️ Note: Filter media sold separately. Requires 60 kg sand or 48 kg glass media.

📐 Pool Sizing Guide

Sizing Principle: Your filter should turn over your entire pool volume within 6-8 hours for optimal water clarity and hygiene. The AstralPool Millennium 430mm delivers 7 m³/h, providing excellent turnover rates for medium-sized residential pools.

Formula:

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

Pool Size Compatibility:

Pool Type	Volume Range	Turnover Time	Suitability
🏊 Small above-ground	Up to 20,000 L	~3 hours	✅ Excellent – rapid turnover
🏊 Medium above-ground	20,000-35,000 L	3-5 hours	✅ Ideal performance range
🏠 Large above-ground	35,000-42,000 L	5-6 hours	✅ Optimal turnover
🏠 Small in-ground	Up to 30,000 L	~4 hours	✅ Excellent performance
🏠 Medium in-ground	30,000-40,000 L	4-6 hours	✅ Ideal – designed for this range
🏡 Larger in-ground	40,000-56,000 L	6-8 hours	⚠️ Acceptable maximum

This Filter:

📍 Flow Rate: 7 m³/h (7,000 litres per hour)

📍 Optimal Pool Size: 35,000-42,000 litres (6-hour turnover)

📍 Maximum Recommended: 56,000 litres (8-hour turnover)

💡 Sizing Tip: For pools exceeding 45,000 litres or those with heavy use, consider the larger Millennium 480mm model for improved turnover times.

🔌 Installation Requirements

Plumbing Specifications:

Requirement	Specification
Inlet Connection	1½” (38 mm) threaded
Outlet Connection	1½” (38 mm) threaded
Valve Position	Top mount
Pipe Recommendation	50 mm rigid PVC or flexible hose

Physical Installation:

Requirement	Details
Base	Solid, level concrete pad or paving slab
Clearance Above	Minimum 500 mm for valve operation and media access
Clearance Around	Minimum 400 mm for plumbing connections and maintenance
Location	Outdoor installation suitable – UV and weather resistant
Drainage	Backwash discharge point required within reach

Pump Compatibility:

Parameter	Specification
Recommended Pump Power	0.5 HP (0.37 kW)
Optimal Flow Rate	6-7 m³/h
Maximum Flow Rate	7 m³/h – do not exceed

⚠️ Important: Over-sizing your pump can damage filter internals and reduce filtration efficiency. The AstralPool Sena ½ HP pump is the manufacturer’s recommended pairing.

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🔄 Maintenance Guide

Routine Maintenance Schedule:

Task	Frequency	Procedure
Check pressure gauge	Weekly	Record baseline when clean; monitor for increases
Backwash filter	Every 1-2 weeks	When pressure rises 0.5 bar above clean baseline
Rinse after backwash	After every backwash	Run 30-60 seconds to settle media bed
Inspect valve seals	Each season	Check O-rings; lubricate or replace if worn
Check media level	Annually	Top up if settling has occurred
Replace filter media	Every 5-7 years (sand)	Complete media change when efficiency declines

Pressure Gauge Monitoring:

📊 Clean filter: Note pressure reading after fresh backwash (typically 0.5-0.8 bar)

📊 Backwash trigger: When pressure rises 0.5 bar above your baseline

📊 Maximum pressure: 2.5 bar – stop pump and investigate if exceeded

Backwash Procedure:

1. Turn off pump
2. Set multiport valve to “Backwash” position
3. Turn on pump and run until sight glass shows clear water (2-3 minutes)
4. Turn off pump
5. Set valve to “Rinse” position
6. Run pump for 30-60 seconds
7. Turn off pump and return valve to “Filter” position
8. Resume normal operation

Winterisation (Essential for UK Climate):

1. Perform final backwash and rinse of the season
2. Turn off pump and set valve to “Winter” position
3. Remove drain plug from filter base
4. Open manual water bleed to ensure complete drainage
5. Store drain plug in a safe, memorable location
6. Cover filter or move to frost-free storage if possible
7. Never leave water in filter during freezing conditions

⚠️ Warning: Water left in the filter tank will expand when frozen, potentially cracking the tank and voiding warranty.

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🪨 Filter Media Information

This filter is supplied without media – you’ll need to purchase filter media separately. The Millennium 430mm is compatible with several media types:

Compatible Media Options:

Media Type	Quantity Required	Filtration Rating	Lifespan	Key Benefits
Silica Sand (#16)	60 kg	20-40 microns	5-7 years	Economical, readily available
Glass Media	48 kg	5-15 microns	10+ years	Superior clarity, eco-friendly
Zeolite/ZeoSand	30 kg	3-5 microns	5 years	Finest filtration, reduces chloramines

Media Selection Guide:

🪨 Silica Sand – The traditional choice offering reliable filtration at the lowest initial cost. Ideal for budget-conscious pool owners who don’t mind replacing media every 5-7 years.

💎 Glass Media – Premium option filtering particles 3-4 times smaller than sand. Higher upfront cost offset by 10+ year lifespan and reduced backwashing. Recommended for those prioritising water clarity.

✨ Zeolite – Specialist media offering the finest filtration plus ammonia absorption to reduce chloramine formation. Best for pools where water quality is paramount or swimmers have sensitive skin/eyes.

Signs Your Media Needs Replacing:

• Persistent cloudy water despite correct chemical balance
• Very short filter cycles (less than 3-4 days between backwashes)
• Dirty water returning through pool jets
• Media visible in pool (lateral damage)
• Filter over 7 years old with declining performance

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🔬 Filtration Performance

Metric	With Sand	With Glass
Filtration Rating	20-40 microns	5-15 microns
Filter Area	0.145 m²	0.145 m²
Filtration Rate	50 m³/h/m²	50 m³/h/m²

What Different Micron Ratings Capture:

Rating	Particles Removed
40+ microns	Leaves, large debris, visible insects
20-40 microns	Fine sand, dirt, hair, visible particles
10-20 microns	Pollen, fine dust, some algae spores
5-15 microns	Most algae, bacteria clusters, very fine particles
3-5 microns	Virtually all algae types, ultra-fine debris

💡 Context: Human hair measures approximately 70 microns. This filter with glass media captures particles up to 14 times finer than a human hair.

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⚙️ Valve Positions and Functions

The included AstralPool 6+1 multiport valve provides complete system control:

Position	Function	When to Use
Filter	Normal filtration	Daily operation – water passes through media, returns clean to pool
Backwash	Reverses flow direction	Clean filter when pressure rises 0.5 bar above baseline
Rinse	Forward flow to waste	After backwashing – settles media and clears residual debris
Waste	Bypasses filter to drain	Lowering water level, vacuuming heavy debris directly out
Recirculate	Bypasses filter to pool	Circulating chemicals quickly, testing pump without filtering
Closed	Stops all water flow	Pump maintenance, equipment servicing
Winter	Pressure relief position	UK winterisation – allows complete tank drainage

⚠️ Critical: Always stop the pump before changing valve positions. Changing under pressure can damage valve seals and internals.

🎯 Ideal Applications

Application	Pool Volume	Assessment
🏊 Residential above-ground pools	Up to 40,000 L	✅ Ideal – designed for this application
🏠 Residential in-ground pools	Up to 40,000 L	✅ Excellent – optimal performance range
🏡 Garden feature pools	Up to 42,000 L	✅ Perfect match
🏊 Swim spas	Up to 15,000 L	✅ Excellent – provides rapid turnover
🏠 Plunge pools	Up to 20,000 L	✅ Ideal sizing

Not Suitable For:

❌ Commercial or public swimming pools

❌ Pools exceeding 56,000 litres

❌ High bather load applications

❌ Pools requiring rapid turnover (competition, training facilities)

❓ Frequently Asked Questions

Q: What size pool is this filter suitable for?

A: The Millennium 430mm handles pools up to 40,000 litres with optimal 6-hour turnover, or up to 56,000 litres with acceptable 8-hour turnover. For best results in UK conditions, we recommend pools up to 42,000 litres.

Q: Does this filter come with sand or media?

A: No, filter media is sold separately. You’ll need 60 kg of sand or 48 kg of glass media to fill this filter. This allows you to choose the media type that best suits your needs.

Q: How often should I backwash?

A: Backwash when your pressure gauge reads 0.5 bar above the clean baseline – typically every 1-2 weeks during swimming season. Heavy use, storms, or algae treatment may require more frequent backwashing.

Q: Can I use glass media instead of sand?

A: Yes, absolutely. The Millennium is fully compatible with glass media, which provides finer filtration (5-15 microns vs 20-40 microns for sand) and lasts longer. Use 48 kg of glass media (20% less than sand by weight).

Q: What pump do I need?

A: Pair with a 0.5 HP pump delivering 6-7 m³/h. The AstralPool Sena ½ HP is the manufacturer-recommended match. Never exceed the filter’s 7 m³/h maximum flow rate.

Q: Is this filter suitable for saltwater pools?

A: Yes, the corrosion-resistant plastic construction is fully compatible with salt chlorination systems.

Q: How long does the filter last?

A: The filter tank and valve should last 15-20+ years with proper care. Media requires replacement every 5-7 years (sand) or 10+ years (glass).

Q: What’s included in the box?

A: Filter tank, 6+1 position multiport valve with bayonet fitting, pressure gauge, internal diffuser, bottom collector with lateral arms, air bleed valve, water drain plug, and installation manual. Media not included.

Q: Can I install this myself?

A: DIY installation is possible for competent homeowners. However, professional installation ensures correct plumbing, proper pump matching, and maintains warranty validity. Contact Parts4Tubs for installer recommendations.

🏆 Why Choose the AstralPool Millennium 430mm

✅ Proven Reliability – One-piece seamless construction eliminates leak points that plague cheaper filters

✅ Complete Valve System – 6+1 position multiport included with essential UK winterisation setting

✅ Flexible Media Options – Compatible with sand, glass, or zeolite to suit your filtration preferences

✅ Right-Sized for UK Pools – 40,000 litre capacity suits typical British residential pools perfectly

✅ Low Maintenance Design – Integrated pressure gauge and bleed valves make servicing straightforward

✅ Outdoor Durability – Chemical and UV resistant construction handles year-round British weather

✅ Trusted Brand – AstralPool’s global reputation for pool equipment quality and innovation

✅ Excellent Value – Professional-grade filtration performance at a competitive price point

🤝 Why Buy From Parts4Tubs

✅ UK-Based Specialists – Local expertise understanding British pool requirements and climate

✅ Fast UK Delivery – Prompt dispatch to get your filtration system up and running quickly

✅ Expert Advice – Knowledgeable team for sizing guidance, pump matching, and technical questions

✅ Competitive Pricing – Great value on genuine AstralPool equipment

✅ Full Warranty Support – Direct assistance with any manufacturer warranty matters

✅ Easy Returns – 30-day return policy for confident purchasing

✅ Complete Range – Filter media, replacement parts, and compatible pumps all available

✅ Ongoing Support – Here to help with spare parts and advice throughout your filter’s lifetime

💧 Summary

The AstralPool Millennium 430mm Top Mount Sand Filter with Valve delivers reliable, efficient filtration for residential pools up to 40,000 litres. Featuring robust one-piece construction, an integrated 6+1 multiport valve with UK-essential winterisation capability, and compatibility with sand, glass, or zeolite media, this filter offers the flexibility and performance discerning pool owners demand.

The 7 m³/h flow rate ensures optimal turnover for medium-sized pools, whilst the corrosion-resistant design provides years of trouble-free outdoor operation. Backed by AstralPool’s 2-year warranty and Parts4Tubs’ UK-based support, this filter represents an excellent investment in long-term pool water quality.

Order today and experience the crystal-clear difference that quality filtration makes.