🌊 AstralPool Millennium 430mm Top Mount Sand Filter with Glass Media – 40,000 Litre Capacity

Superior filtration technology for pristine swimming conditions all season long

💧 Product Overview

The AstralPool Millennium 430mm Top Mount Filter represents the pinnacle of residential pool filtration design, combining sleek modern aesthetics with exceptional filtering performance. Manufactured by AstralPool, this premium filter features an innovative one-piece blow-moulded construction that eliminates joints and potential leak points, ensuring reliable, maintenance-free operation for years to come.

Designed specifically for residential in-ground and above-ground pools up to 40,000 litres, this filter delivers a robust 7 m³/h flow rate through its advanced multiport valve system. The ivory-coloured, corrosion-resistant tank is engineered for outdoor installation and withstands chemical and atmospheric conditions without deterioration. This package includes high-quality glass filter media for enhanced filtration down to 5-15 microns, delivering crystal-clear water quality that surpasses traditional sand filtration.

The integrated 6+1 position selector valve with bayonet closure provides complete control over all filtration operations, including a dedicated winterisation setting essential for UK pool owners.

✨ Key Features

✅ One-Piece Moulded Construction – Jointless blow-moulded tank eliminates leak points and ensures long-term reliability

✅ 7 m³/h Flow Rate – Powerful filtration capacity suitable for pools up to 40,000 litres with optimal 6-hour turnover

✅ Glass Media Included – Premium glass filter media for superior 5-15 micron filtration and crystal-clear water

✅ 6+1 Position Multiport Valve – Complete control including filter, backwash, rinse, recirculate, waste, close, and winter positions

✅ 2.5 Bar Working Pressure – Robust construction handles demanding filtration requirements safely

✅ Built-In Pressure Gauge – Easy monitoring of filter condition and backwash timing mounted directly on valve

✅ Manual Air and Water Bleeds – Integrated purge valves for easy maintenance and winterisation without media loss

✅ 1½” Connections – Standard fittings for compatibility with most residential pool plumbing systems

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

✅ 2-Year Manufacturer Warranty – AstralPool quality guarantee against manufacturing defects

⚙️ Technical Specifications

Specification	Value
Filter Type	Sand/Glass Media (Top Mount)
Pool Capacity	Up to 40,000 litres (40 m³)
Flow Rate	7 m³/h (7,000 l/h)
Filter Area	0.145 m²
Filtration Rating	5-15 microns (with glass media)
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 (20% less than sand)
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 (Bayonet)
Filtration Rate	50 m³/h/m²
Weight (Empty)	14 kg
Certifications	EN 16713-1
Warranty	2 years

📏 Pool Sizing Guide

Sizing Principle: Your filter flow rate should turn over your entire pool volume within 6-8 hours for optimal water quality. The AstralPool Millennium 430mm delivers 7 m³/h flow rate, making it ideal for pools up to 40,000 litres.

Formula:

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

Pool Size Compatibility:

Pool Type	Volume Range	Suitability
🏊 Small above-ground	Up to 20,000 L	✅ Excellent – provides 3-hour turnover
🏊 Medium above-ground	20,000-35,000 L	✅ Ideal – provides 3-5 hour turnover
🏠 Large above-ground	35,000-42,000 L	✅ Good – provides 5-6 hour turnover
🏠 Small in-ground	Up to 30,000 L	✅ Excellent – provides 4-5 hour turnover
🏠 Medium in-ground	30,000-40,000 L	✅ Ideal – provides optimal 6 hour turnover
🏠 Larger in-ground	40,000-56,000 L	⚠️ Acceptable with 8-hour turnover

This Filter:

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

📍 Optimal for pools: 35,000-42,000 litres (6-hour turnover)

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

💡 Tip: For best water clarity, aim for 6-hour turnover time. If your pool exceeds 42,000 litres, consider the larger Millennium 480mm model.

🛠️ Installation Requirements

Plumbing Connections:

Requirement	Specification
Inlet Connection	1½” (38 mm)
Outlet Connection	1½” (38 mm)
Valve Position	Top mount
Connection Type	Threaded

Physical Installation:

Requirement	Details
Base	Solid, level concrete or paving slab required
Clearance above	Minimum 500 mm for valve operation and lid access
Clearance around	Minimum 400 mm for plumbing and maintenance
Location	Suitable for outdoor installation
Drainage	Backwash discharge point required nearby

Pump Compatibility:

⚠️ Important: Filter must be matched with an appropriate pump for optimal performance.

Parameter	Recommendation
Recommended pump power	0.5 HP (0.37 kW)
Ideal pump flow rate	6-7 m³/h
Maximum pump flow rate	Do not exceed 7 m³/h

💡 Tip: The AstralPool Sena ½ HP pump is the manufacturer’s recommended pairing for this filter, delivering optimal flow rates for efficient filtration without exceeding filter capacity.

🔄 Maintenance Guide

Routine Maintenance Schedule:

Task	Frequency	Procedure
Check pressure gauge	Weekly	Note reading; establish baseline when filter is clean
Backwash filter	Every 1-2 weeks or when pressure rises 0.5 bar	Run until sight glass clears (typically 2-3 minutes)
Rinse after backwash	After each backwash	Run for 30-60 seconds to settle media
Inspect seals and O-rings	Seasonally	Check valve and lid seals; lubricate or replace if worn
Check media level	Annually	Top up if level has dropped significantly
Full media replacement	Every 10+ years (glass)	Replace completely when filtration quality declines

Pressure Gauge Guide:

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

📊 Backwash required: When pressure rises 0.5 bar above baseline

📊 Maximum safe pressure: 2.5 bar – do not exceed

⚠️ Warning: If pressure exceeds 2.5 bar, stop pump immediately and investigate blockage.

Winterisation (Essential for UK Climate):

1. Backwash and rinse filter thoroughly
2. Set multiport valve to “Winter” position
3. Remove drain plug and allow tank to drain completely
4. Use manual water bleed to ensure complete drainage
5. Store drain plug safely – never leave in filter during winter
6. Cover filter or relocate to frost-free location if possible
7. Never leave water in filter during freezing conditions – ice expansion can crack tank

💎 Filter Media Information

This filter package includes premium glass filter media for superior water clarity. Glass media can also be replaced with traditional sand if preferred.

Compatible Media Types:

Media Type	Filtration Rating	Lifespan	Quantity Required	Benefits
Glass Media	5-15 microns	10+ years	48 kg	Superior clarity, longer lasting, eco-friendly
Silica Sand	20-40 microns	5-7 years	60 kg	Economical, widely available
ZeoSand/Zeolite	3-5 microns	5 years	30 kg	Finest filtration, chloramine reduction

Glass Media Advantages:

✅ Filters particles 3-4 times smaller than sand

✅ Lasts twice as long as traditional sand

✅ Requires 20% less backwashing

✅ Made from 100% recycled materials

✅ Does not harbour bacteria like sand can

✅ Negative charge attracts fine particles

Signs Media Needs Replacing:

• Consistently poor water clarity despite correct chemical balance
• Very short filter cycles between backwashes (less than 3 days)
• Cloudy water returning to pool through jets
• Visible channelling or clumping in media bed
• Media escaping into pool during filtration

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🔬 Filtration Performance

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

Micron Rating Guide – What Your Filter Catches:

Rating	What It Captures
40+ microns	Visible debris, leaves, large insects
20-40 microns	Fine sand, visible dirt particles, hair
10-20 microns	Very fine particles, pollen, some algae spores
5-15 microns	Microscopic particles, most algae, bacteria clumps
3-5 microns	Ultra-fine particles, virtually all algae types

💡 Perspective: A human hair is approximately 70 microns thick. This filter with glass media captures particles 5-14 times smaller than a human hair.

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⚙️ Valve Positions and Functions

The AstralPool 6+1 position multiport valve provides complete control over your filtration system:

Position	Function	When to Use
Filter	Normal filtration operation	Daily operation – water flows through media and returns clean to pool
Backwash	Reverses flow to flush debris from media	When pressure gauge rises 0.5 bar above clean baseline
Rinse	Settles media and clears lines after backwash	Always use for 30-60 seconds after backwashing
Waste	Bypasses filter, sends water directly to drain	Lowering water level, vacuuming heavy debris
Recirculate	Bypasses filter, returns water to pool	Testing pump flow, circulating chemicals quickly
Closed	Stops all water flow	Pump maintenance, system servicing
Winter	Relieves pressure for winterisation	Essential for UK winter – allows complete drainage

⚠️ Important: Never change valve position while pump is running. Always stop pump first to avoid damaging valve seals.

🎯 Ideal Applications

Application	Pool Volume	Suitability
🏠 Residential above-ground	Up to 40,000 L	✅ Ideal – designed for this application
🏠 Residential in-ground	Up to 40,000 L	✅ Excellent – optimal performance range
🏡 Garden/landscaped pools	Up to 42,000 L	✅ Perfect match with attractive design
🏊 Swim spas	Up to 15,000 L	✅ Excellent – provides rapid turnover

Not Recommended For:

❌ Commercial or public pools (insufficient capacity)

❌ Pools exceeding 56,000 litres (inadequate turnover)

❌ High-bather-load applications

❓ Frequently Asked Questions

Q: What size pool will this filter handle?

A: The Millennium 430mm is rated for pools up to 40,000 litres with optimal 6-hour turnover, or up to 56,000 litres with 8-hour turnover. For best water quality in UK conditions, we recommend pools up to 42,000 litres.

Q: How often do I need to backwash?

A: Backwash when the pressure gauge reads 0.5 bar above your clean baseline reading – typically every 1-2 weeks during swimming season. More frequent backwashing may be needed after heavy use, storms, or algae treatment.

Q: What filter media should I use?

A: This filter comes with glass media included, which provides superior 5-15 micron filtration. You can also use traditional #16 silica sand (60 kg capacity) or zeolite (30 kg) if preferred. Glass media lasts longer and requires less maintenance.

Q: How long does the filter media last?

A: Glass media typically lasts 10+ years with proper maintenance. Sand requires replacement every 5-7 years. Zeolite lasts approximately 5 years.

Q: What pump do I need?

A: Pair with a pump delivering 6-7 m³/h flow rate. A 0.5 HP (½ CV) pump like the AstralPool Sena is ideal. Never exceed the filter’s 7 m³/h maximum flow rate.

Q: Can I install this filter myself?

A: While DIY installation is possible for experienced homeowners, we recommend professional installation to ensure correct plumbing, proper pump matching, and valid warranty coverage.

Q: What warranty is included?

A: AstralPool provides a 2-year manufacturer warranty against manufacturing defects. Contact Parts4Tubs for full warranty terms and claim procedures.

Q: Is this filter suitable for salt chlorinated pools?

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

Q: How do I winterise this filter?

A: Set valve to Winter position, drain tank completely using the manual water bleed, remove and store drain plug. Never leave water in the filter during freezing conditions.

🏆 Why Choose the AstralPool Millennium 430mm

✅ Premium Filtration Quality – Glass media delivers 5-15 micron filtration for crystal-clear water that rivals DE filters

✅ Superior Build Quality – One-piece jointless construction eliminates leak points and ensures decades of reliable operation

✅ Complete Valve Control – 6+1 position multiport valve provides every function needed including essential UK winterisation

✅ Optimal Size for UK Homes – Perfect capacity for typical British garden pools from 25,000-42,000 litres

✅ Low Maintenance Design – Built-in pressure gauge, air bleed, and water drain make servicing straightforward

✅ Trusted Brand Quality – AstralPool’s reputation for pool equipment excellence backed by 2-year warranty

✅ Weather-Resistant Construction – Designed for permanent outdoor installation in all UK weather conditions

✅ Future-Proof Filtration – Compatible with sand, glass, or zeolite media for flexible performance options

🤝 Why Buy From Parts4Tubs

✅ UK-Based Company – Local support from pool equipment specialists who understand British pool requirements

✅ Fast UK Delivery – Quick dispatch to get your pool filtration system operational promptly

✅ Expert Technical Advice – Knowledgeable team available for sizing guidance and installation questions

✅ Competitive Pricing – Great value on genuine AstralPool equipment

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

✅ Easy Returns – 30-day return policy for peace of mind purchasing

✅ Comprehensive Stock – Compatible filter media, spare parts, and accessories readily available

✅ Glass Media Included – This package comes complete with premium glass filter media

⭐ Summary

The AstralPool Millennium 430mm Top Mount Filter with Glass Media delivers professional-grade filtration performance for residential pools up to 40,000 litres. Featuring premium one-piece construction, a comprehensive 6+1 position multiport valve with winterisation capability, and included glass media for superior 5-15 micron water clarity, this filter represents outstanding value for UK pool owners seeking reliable, low-maintenance filtration.

The 7 m³/h flow rate provides optimal 6-hour turnover for medium-sized pools, while the corrosion-resistant design ensures trouble-free outdoor operation through British seasons. Backed by AstralPool’s 2-year warranty and supported by Parts4Tubs’ UK-based expertise, this filter system delivers everything needed for crystal-clear pool water season after season.

Order today for fast UK delivery and start enjoying pristine pool water with minimal maintenance effort.