🌊 Lacron 20″ Sureflow LSR Side Mount Sand Filter c/w 1.5″ MPV – 60,000 Litre Pool Capacity

Powerful British-engineered filtration for sparkling clean pool water, season after season

💧 Product Overview

The Lacron 20″ Sureflow LSR Side Mount Sand Filter represents the pinnacle of British pool filtration engineering, manufactured by Waterco to deliver exceptional water clarity for medium to large residential swimming pools. This professional-grade sand filter features a robust glass reinforced polyester (GRP) tank that combines exceptional durability with outstanding filtration performance.

Designed for permanent in-ground residential swimming pools, the LSR-20 handles pools up to 60,000 litres with its impressive 10 m³/hr maximum flow rate. The side-mount configuration offers excellent accessibility for maintenance and servicing, whilst the included 1.5″ six-position multiport valve provides complete control over all filtration operations. Built to withstand the demands of UK pool ownership, this filter is rigorously pressure tested to 4 bar and features comprehensive UV and corrosion resistance for years of trouble-free operation.

✨ Key Features

✅ Glass Reinforced Polyester Construction – Extremely hard-wearing GRP tank provides exceptional strength and longevity with complete corrosion resistance

✅ 10 m³/hr Maximum Flow Rate – Handles pools up to 60,000 litres with efficient water turnover for crystal-clear results

✅ Six-Position Multiport Valve Included – Complete 1.5″ (50mm) MPV for filter, backwash, rinse, waste, recirculate, and closed operations

✅ Side Mount Configuration – Convenient lateral placement ensures easy access for maintenance, servicing, and winterisation

✅ Large 204mm Clear Lid – 8-inch transparent inspection lid allows visual monitoring of filter bed condition and backwash effectiveness

✅ Hydraulically Balanced Laterals – Advanced underdrain system maximises water flow and filtration efficiency across the entire filter bed

✅ Inflow Diffuser System – Ensures even distribution of water across the filter media for consistent filtration performance

✅ Integrated Pressure Gauge – Monitor filter condition and know precisely when backwashing is required

✅ Quick Connect Unions – Simple barrel union connections for straightforward installation and future servicing

✅ Winter Drain Plug – Dedicated drainage point for proper winterisation in UK climate conditions

✅ UV and Corrosion Resistant – Built to withstand outdoor UK conditions year after year

✅ 5-Year Tank Warranty – Comprehensive 5 (1+4) year warranty on tank demonstrates manufacturer confidence

🔧 Technical Specifications

Specification	Value
Filter Type	High-Rate Sand Filter
Model	LSR-20 / 222020-KIT
Pool Capacity	Up to 60,000 litres (60 m³)
Maximum Flow Rate	10 m³/hr
Filter Area	0.20 m²
Filtration Rating	20-40 microns (with sand media)
Tank Diameter	500 mm (20″)
Overall Height	900 mm
Bed Depth	365 mm
Clear Lid Diameter	204 mm (8″)
Sand Media Capacity	100 kg
Glass Media Capacity	80 kg
Test Pressure	4 bar
Maximum Working Pressure	2.5 bar
Inlet/Outlet Size	1.5″ (50 mm) BSP
Valve Type	6-Position Multiport (included)
Tank Material	Glass Reinforced Polyester (GRP)
Mount Type	Side Mount
Temperature Range	0°C to 50°C
Tank Warranty	5 years (1+4)
Components Warranty	1 year

📏 Pool Sizing Guide

Sizing Principle: The filter flow rate should turn over the entire pool volume within 6-8 hours for optimal water quality and clarity.

Formula:

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

Pool Size Compatibility:

Pool Type	Volume Range	Suitability
🏊 Small above-ground	Up to 20,000 L	✅ Excellent – ample capacity with headroom
🏊 Medium above-ground	20,000-40,000 L	✅ Excellent – ideal match for this range
🏊 Large above-ground	40,000-60,000 L	✅ Good – at upper limit of capacity
🏠 Small in-ground	Up to 40,000 L	✅ Excellent – perfect for smaller in-ground pools
🏠 Medium in-ground	40,000-60,000 L	✅ Good – suitable at maximum capacity
🏠 Large in-ground	60,000+ L	⚠️ Consider larger LSR-24 or LSR-30 model

This Filter:

📍 Flow Rate: 10 m³/hr
📍 Suitable for pools up to: 60,000 litres
📍 Optimal pool size: 30,000-50,000 litres (6-hour turnover)

🛠️ Installation Requirements

Plumbing Connections

Requirement	Specification
Inlet Connection	1.5″ (50 mm) BSP
Outlet Connection	1.5″ (50 mm) BSP
Valve Position	Side Mount
Connection Type	Quick connect barrel unions

Physical Installation

Requirement	Details
Base	Solid, level concrete slab or equivalent firm ground
Clearance Above	Sufficient space for lid removal and media inspection
Clearance Around	Access for multiport valve operation and winterisation
Positioning	As close to pool as practical, protected from flooding

Pump Compatibility

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

• Recommended pump flow rate: 6-10 m³/hr
• Pump must not exceed: 10 m³/hr (filter’s maximum flow rate)
• Ensure: Pump discharge pressure remains below 2.5 bar during operation

💡 Tip: Install isolation valves on inlet and outlet if filter is below water level or connected to mains water supply.

🔄 Maintenance Guide

Routine Maintenance Schedule

Task	Frequency	How
Check pressure gauge	Weekly	Note reading and compare to baseline
Backwash filter	When pressure rises 0.5 bar above baseline	Run until sight glass clears (2-3 minutes)
Rinse after backwash	After each backwash	Run for 10-20 seconds
Clean pump strainer	Weekly	Remove and rinse basket
Inspect seals and O-rings	Seasonally	Replace if worn or damaged
Check media level	Annually	Top up if settled significantly
Full media replacement	Every 5-7 years (sand)	Complete media change

Pressure Gauge Guide

📊 Clean filter baseline: Record initial pressure after first startup
📊 Backwash trigger: When pressure rises 50 kPa (0.5 bar) above baseline
📊 Maximum safe operating pressure: 2.5 bar

Water Chemistry for Optimal Filtration

Maintain correct water balance to protect filter media and extend its lifespan:

Parameter	Recommended Range
pH Level	7.2 – 7.8
Total Alkalinity	80 – 150 ppm
Calcium Hardness	150 – 300 ppm

Winterisation (UK Climate)

Proper winterisation is essential to protect your filter from frost damage:

1. Switch off pump and close inlet valve
2. Open air release valve on filter or multiport valve
3. Move multiport valve handle to winterise position (between Filter and Waste)
4. Remove drain plugs from filter
5. Drain all water from pipework
6. Store drain plugs safely for spring reinstallation
7. Cover filter or store in frost-free location if possible

⚠️ Critical: Never leave water in filter during freezing conditions – ice expansion can crack the tank and void warranty.

🪨 Filter Media Information

Compatible Media Types

Media Type	Filtration Rating	Lifespan	Benefits
Silica Sand (16-30 grade)	20-40 microns	5-7 years	Economical, proven performance, easy maintenance
Glass Media (Lacronite)	5-15 microns	10+ years	Finer filtration, longer life, reduced backwash frequency
ZeoSand	3-5 microns	5 years	Superior water clarity, removes chloramines

Media Capacity

• Sand capacity: 100 kg
• Glass media capacity: 80 kg
• Recommended grade: 16-30 silica sand (0.35mm to 0.55mm particle size)

💡 Note: Pea gravel base layer is not required for this filter model.

Signs Media Needs Replacing

• Poor water clarity despite correct chemical balance
• Short filter cycles requiring frequent backwashing
• Cloudy water returning to pool after backwash
• Visible channelling in filter bed through inspection lid
• Media age exceeds 5-7 years for sand

💎 Filtration Performance

Metric	Value
Filtration Rating	20-40 microns (sand) / 5-15 microns (glass)
Filter Area	0.20 m²
Bed Depth	365 mm
Flow Distribution	Uniform via inflow diffuser
Collection System	Hydraulically balanced laterals

Micron Rating Guide

Rating	What It Catches
40+ microns	Visible debris, leaves, large particles
20-40 microns	Sand, dirt, visible particles, hair
10-20 microns	Fine particles, some algae spores
5-10 microns	Very fine particles, most algae, improved clarity
Under 5 microns	Ultra-fine particles, bacteria, exceptional clarity

How Depth Filtration Works

The Lacron LSR operates on the principle of “depth filtration” – contaminated water enters through the top inlet and is distributed evenly via the inflow diffuser. As water passes through the media bed, dirt particles become embedded between media grains. Clean water then passes through the hydraulically balanced laterals and returns to the pool via the outlet port.

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⚙️ Multiport Valve Positions & Functions

The included 6-position multiport valve provides complete control over all filtration operations:

Position	Function
Filter	Normal filtration mode – water flows through media bed to pool
Backwash	Reverses flow to clean media – dirt flushed to waste
Rinse	Settles media after backwash – prevents debris returning to pool
Waste	Bypasses filter – drains water directly to waste
Recirculate	Bypasses filter – returns water to pool unfiltered
Closed	Stops all flow – for pump servicing (never use with pump running)

⚠️ Important: Always switch off pump before changing valve positions to protect the spider gasket and ensure safe operation.

🎯 Ideal Applications

Application	Pool Size	Suitability
🏠 Residential above-ground	Up to 60,000 L	✅ Excellent choice
🏠 Residential in-ground	Up to 60,000 L	✅ Ideal for medium pools
🏡 Holiday home pools	Up to 50,000 L	✅ Reliable seasonal use
🏊 Swim spas	Up to 20,000 L	✅ More than adequate
🌊 Water features	Variable	✅ Suitable for larger features

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❓ Frequently Asked Questions

Q: What size pool will this filter handle?

A: The Lacron 20″ LSR is suitable for pools up to 60,000 litres. With its 10 m³/hr flow rate, it will turn over a 60,000-litre pool in 6 hours, which is optimal for water quality. For pools larger than 60,000 litres, consider the LSR-24 or LSR-30 models.

Q: How often do I need to backwash?

A: Backwash when the pressure gauge reads 0.5 bar (50 kPa / 7.2 psi) above your clean filter baseline, typically every 1-2 weeks during swimming season. Backwash until water in the sight glass runs clear, usually 2-3 minutes, then run the rinse cycle for 10-20 seconds.

Q: What filter media should I use?

A: The filter is compatible with 16-30 grade silica sand (100 kg capacity) or glass media such as Lacronite (80 kg capacity). Sand offers economical performance whilst glass media provides finer filtration and longer lifespan.

Q: How long does filter media last?

A: Sand media typically lasts 5-7 years with proper maintenance. Glass media can last 10+ years. Replace when you notice consistently poor water clarity despite correct chemicals and regular backwashing.

Q: What pump do I need?

A: Match with a pump delivering 6-10 m³/hr. The pump flow rate should not exceed the filter’s 10 m³/hr maximum. Ensure pump discharge pressure stays below 2.5 bar. Parts4Tubs can advise on compatible pump options.

Q: Is the multiport valve included?

A: Yes, this kit (222020-KIT) includes the complete 1.5″ six-position multiport valve with pressure gauge and quick-connect barrel unions.

Q: What warranty is included?

A: Waterco provides a 5-year (1+4) warranty on the filter tank and 1-year warranty on all other components, demonstrating confidence in Lacron build quality.

Q: Can I use this filter with saltwater pools?

A: Yes, Lacron filters are constructed from totally corrosion-resistant materials suitable for both freshwater and saltwater conditions.

Q: How do I winterise the filter?

A: Drain all water from the filter and pipework before temperatures drop below freezing. Remove drain plugs, move the multiport valve to the winterise position, and store in a protected location if possible. Full instructions are in the maintenance section above.

Q: What’s the difference between side mount and top mount filters?

A: Side mount filters like this LSR-20 have the valve mounted on the side of the tank, making valve operation and media inspection easier without removing the valve. Top mount filters have the valve on top, which can be more compact but requires valve removal for media access.

📥 Downloads & Resources

📄 Lacron Filter Product Brochure – Complete product specifications and range overview

📄 Lacron Filter Installation & Operation Manual – Comprehensive installation guide and operating instructions

📄 Lacron Filter Technical Details – Technical specifications and parts diagrams

🏆 Why Choose the Lacron 20″ Sureflow LSR

✅ British Engineering Excellence – Designed and manufactured by Waterco to exacting standards for reliable UK pool filtration

✅ Robust GRP Construction – Glass reinforced polyester tank withstands years of demanding use without corrosion

✅ Complete Filtration Package – Includes everything needed: filter tank, multiport valve, pressure gauge, and fittings

✅ Optimal Flow Performance – 10 m³/hr capacity handles pools up to 60,000 litres with efficient turnover

✅ Easy Maintenance Access – Side-mount design and large clear lid make servicing and inspection straightforward

✅ Proven Reliability – Rigorously pressure tested to 4 bar with 5-year tank warranty for peace of mind

✅ Versatile Media Options – Compatible with sand or glass media to suit your filtration preferences and budget

✅ UK Climate Ready – Built-in winter drain and frost-resistant design for year-round UK conditions

🤝 Why Buy from Parts4Tubs

✅ UK-Based Company – Local support from pool specialists who understand UK pool ownership

✅ Fast UK Delivery – Quick dispatch to get your pool back up and running

✅ Expert Advice – Friendly team available to help with sizing, installation, and compatibility questions

✅ Competitive Pricing – Great value on genuine Lacron filtration equipment

✅ Full Warranty Support – We stand behind everything we sell with comprehensive after-sales service

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

✅ Compatible Parts Available – Filter media, replacement valves, spare parts, and accessories all in stock

⭐ Summary

The Lacron 20″ Sureflow LSR Side Mount Sand Filter delivers professional-grade filtration for residential pools up to 60,000 litres. Featuring robust glass reinforced polyester construction, a 10 m³/hr flow rate, and a complete 1.5″ multiport valve system, this British-engineered filter provides years of reliable, crystal-clear results. The side-mount configuration ensures easy maintenance access, whilst the 5-year tank warranty demonstrates Waterco’s confidence in Lacron quality. Order today from Parts4Tubs for fast UK delivery and expert support.