🌊 Lacron 16″ Sureflow LSR Side Mount Sand Filter – 37,000 Litre Pool Capacity

Effortless pool maintenance with professional-grade British filtration technology

💧 Product Overview

The Lacron 16″ Sureflow LSR Side Mount Sand Filter represents the pinnacle of British pool filtration engineering. Manufactured by Waterco, this compact yet powerful sand filter delivers exceptional water clarity for residential pools up to 37,000 litres.

Built from premium glass reinforced polyester (GRP), this filter combines rugged durability with sophisticated filtration technology. The side-mount configuration provides convenient access for maintenance while the included 6-position multiport valve gives you complete control over all filtration functions.

Whether you’re installing a new pool system or upgrading existing equipment, the Lacron LSR-16 offers the perfect balance of performance, reliability, and ease of maintenance. Tested to 4 bar and certified to the highest standards, this filter is designed for years of trouble-free operation in both fresh and salt-water conditions.

⭐ Key Features

✅ Glass Reinforced Polyester (GRP) Tank – Extremely hard-wearing construction with UV and corrosion resistance for extended lifespan

✅ 6-Position Multiport Valve Included – Complete control with Filter, Backwash, Rinse, Waste, Recirculate, and Closed positions

✅ 6.5 m³/h Flow Rate – Optimal flow capacity for pools up to 37,000 litres with efficient turnover

✅ Side Mount Configuration – Easy access for maintenance and operation with convenient valve positioning

✅ Hydraulically Balanced Laterals – Maximises water flow and filtration efficiency throughout the filter bed

✅ Integrated Pressure Gauge – Monitor filter performance and know exactly when backwashing is required

✅ Quick Connect Unions – Simplifies installation and future maintenance with 1.5″ (50mm) connections

✅ Winter Drain Plug – Protects your investment during cold UK winters with easy drainage

✅ Clear Inspection Lid – Visual monitoring of the filter bed and backwash process

✅ 5-Year Tank Warranty – 5 (1+4) year tank warranty plus 1 year on all other components demonstrates manufacturer confidence

🔧 Technical Specifications

Specification	Value
Filter Type	Sand Filter (Side Mount)
Pool Capacity	Up to 37,000 litres (37 m³)
Maximum Flow Rate	6.5 m³/h
Filter Area	0.130 m²
Tank Diameter	400 mm (16″)
Bed Depth	300 mm
Overall Height	575 mm (725 mm with valve)
Sand Media Capacity	50 kg
Glass Media Capacity	40 kg
Maximum Operating Pressure	2.5 bar
Test Pressure	4 bar
Inlet/Outlet Size	1.5″ / 50 mm BSP
Valve Type	6-Position Multiport (included)
Tank Material	Glass Reinforced Polyester (GRP)
Pressure Gauge	Included
Operating Temperature	0°C to 50°C
Certifications	Pressure tested and certified
Warranty	5 (1+4) years tank, 1 year components

📐 Pool Sizing Guide

Sizing Principle: The filter flow rate should turn over the entire pool volume within 6-8 hours for optimal water quality. This ensures debris and contaminants are captured before they can affect water clarity.

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 – generous capacity margin
🏊 Medium above-ground	20,000-37,000 L	✅ Ideal – within optimal operating range
🏊 Large above-ground	37,000+ L	⚠️ Consider larger 18″ or 20″ model
🏠 Small in-ground	Up to 30,000 L	✅ Well suited for compact pools
🏠 Medium in-ground	30,000-37,000 L	✅ Good match at maximum capacity
🏢 Commercial	Any size	❌ Not recommended – see commercial range

This Filter:

📍 Maximum Flow Rate: 6.5 m³/h
📍 Maximum Pool Capacity: 37,000 litres
📍 Ideal Pool Size: 25,000 - 37,000 litres (6-8 hour turnover)

Example Calculation: For a 30,000 litre pool:

• 30 m³ ÷ 6.5 m³/h = 4.6 hours turnover time
• This exceeds minimum standards and provides excellent filtration

🛠️ 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 required
Ground Stability	Ensure ground will not subside to prevent plumbing strain
Clearance Above	Minimum 300 mm for valve operation
Clearance Around	Minimum 400 mm for maintenance access
Positioning	Close to pool, away from flooding risk areas
Compliance Label	Position facing front for identification

Pump Compatibility

⚠️ Important: Filter must be matched with an appropriately sized pump.

Parameter	Recommendation
Recommended Pump Flow Rate	4.0 – 6.5 m³/h
Maximum Pump Flow Rate	Do not exceed 6.5 m³/h
Pump Position	If 500mm+ above water level, install foot valve/non-return valve
Below Water Level	Install isolation valves at inlet and outlet

💡 Tip: Keep pipe runs as short as possible and minimise fittings to reduce flow restrictions.

🔄 Maintenance Guide

Routine Maintenance Schedule

Task	Frequency	Procedure
Check pressure gauge	Weekly	Normal operating range varies by installation
Backwash filter	When pressure rises 0.5 bar above baseline	Continue until sight glass shows clear water
Rinse after backwash	After every backwash	Run for 10-20 seconds until water clears
Clean pump strainer	Weekly	Remove debris to maintain flow
Clean skimmer baskets	Weekly	Prevents debris reaching filter
Inspect seals and o-rings	Seasonally	Replace if worn or damaged
Check media level	Annually	Top up if significantly low
Full media replacement	Every 5-7 years (sand)	Replace completely when exhausted

Pressure Gauge Guide

📊 Clean filter baseline: Record reading at initial startup
📊 Backwash required: When pressure rises 0.5 bar (50 kPa / 7.2 psi) above baseline
📊 Maximum operating pressure: 2.5 bar

⚠️ Important: If connected to mains water, pressure readings may fluctuate. Monitor actual flow rate as a more reliable indicator.

Backwashing Procedure

1. Stop the pump – Never operate multiport valve while pump is running
2. Release pressure – Loosen pressure release valve until gauge reads zero
3. Set to BACKWASH – Depress handle and rotate 180° to backwash position
4. Start pump – Run until sight glass shows clear water (typically 2-3 minutes)
5. Stop pump – Turn off and set valve to RINSE position
6. Rinse cycle – Run pump for 10-20 seconds to settle media bed
7. Return to FILTER – Stop pump, set to filter position, resume normal operation

Winterisation (UK Climate)

⚠️ Critical for temperatures below 0°C:

• Switch off pump and close inlet valve
• Open air release valve and move multiport handle to winterise position (between Filter and Waste)
• Remove all drain plugs from filter
• Drain water completely from all pipework
• Store drain plugs safely for spring reinstallation
• Cover or relocate filter to frost-free location if possible

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

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🪨 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
Lacronite/Glass Media	5-15 microns	10+ years	Superior clarity, longer lasting
ZeoSand/Zeolite	3-5 microns	5 years	Finest filtration, ammonia removal

Media Capacity for This Filter:

• Sand: 50 kg (16/30 grade, 0.5mm to 1.4mm)
• Glass/Lacronite: 40 kg

💡 Tip: The recommended media is 16-30 grade silica sand (0.5mm to 1.4mm) for excellent results. Glass media offers finer filtration and longer life but at higher initial cost.

Media Installation Notes

• Fill tank half full with water before adding media to cushion the laterals
• Cover air bleed tube with tape to prevent blockage during filling
• Correct media height is approximately 30-50mm above the tank centre
• Never fill the filter completely with media – leave expansion space
• Perform initial backwash for 2-3 minutes to remove dust and fine particles

Signs Media Needs Replacing

• Poor water clarity despite correct chemical balance
• Shortened filter cycles between backwashes
• Cloudy water returns to pool through jets
• Media visible in pool water
• Channelling or caking of filter bed

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🔬 Filtration Performance

Metric	Value
Filtration Area	0.130 m²
Bed Depth	300 mm
Filtration Rating	20-40 microns (with sand)

Micron Rating Guide

Rating	What It Catches
40+ microns	Visible debris, leaves, large particles
20-40 microns	Sand, dirt, visible particles – standard sand filtration
10-20 microns	Fine particles, some algae spores
5-10 microns	Very fine particles, most algae – glass media
3-5 microns	Microscopic particles – zeolite media

Depth Filtration Principle: The Lacron LSR filter operates on depth filtration – dirt particles penetrate the filter bed and become embedded between media grains. The hydraulically balanced lateral system ensures even water distribution and maximum filtration efficiency.

⚙️ Valve Positions & Functions

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

Position	Function	Use
FILTER	Normal filtration	Water passes through media, returns clean to pool
BACKWASH	Reverse flow cleaning	Flushes trapped debris to waste drain
RINSE	Settle media bed	Resettles media after backwash, clears residual debris
WASTE	Bypass to drain	Lowers water level or vacuums heavy debris direct to waste
RECIRCULATE	Bypass filter	Circulates water without filtration – useful for chemical distribution
CLOSED	Stop all flow	Allows pump servicing without draining filter

⚠️ Critical: Always stop the pump before changing valve positions. Depress the handle before rotating to prevent damage to the spider gasket seal.

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🏆 Ideal Applications

Application	Pool Size	Suitability
🏠 Residential above-ground pools	Up to 37,000 L	✅ Excellent
🏡 Small residential in-ground pools	Up to 37,000 L	✅ Very good
🏊 Garden pools and swim spas	Up to 30,000 L	✅ Ideal
💧 Water features	Various	✅ Well suited
🧖 Domestic spa systems	Standard sizes	✅ Good
🏢 Commercial pools	Any	❌ See commercial LSC range

Best For:

• First-time pool owners seeking reliable, low-maintenance filtration
• Compact pool installations where space is limited
• Replacement upgrades for older 16″ filters
• Budget-conscious installations without compromising quality

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❓ Frequently Asked Questions

Q: What size pool will this filter handle? A: The Lacron 16″ LSR is suitable for pools up to 37,000 litres (37 m³). With a maximum flow rate of 6.5 m³/h, it can achieve a complete water turnover in approximately 5-6 hours for a 37,000 litre pool, which exceeds industry standards.

Q: How often do I need to backwash? A: Backwash when the pressure gauge reads 0.5 bar (50 kPa) above your recorded clean baseline. This is typically every 1-2 weeks during swimming season, but varies based on pool usage and debris levels.

Q: What filter media should I use? A: The filter is compatible with 16/30 grade silica sand (50 kg capacity), glass media like Lacronite (40 kg capacity), or zeolite. Sand is most economical; glass media provides finer filtration and longer life.

Q: How long does filter media last? A: Silica sand typically lasts 5-7 years with proper maintenance. Glass media can last 10+ years. Zeolite averages around 5 years but offers the finest filtration.

Q: What pump do I need? A: Match with a pump delivering 4.0-6.5 m³/h. Never exceed the filter’s maximum flow rate of 6.5 m³/h as this forces debris through the filter bed and reduces efficiency.

Q: Can I use this filter with salt water? A: Yes, the GRP (glass reinforced polyester) construction is fully resistant to salt water corrosion, making it suitable for both fresh and salt-chlorinated pools.

Q: What warranty is included? A: Waterco provides a 5 (1+4) year tank warranty – 1 year full coverage plus 4 years pro-rata – and 1 year warranty on all other components including the multiport valve.

Q: How do I prepare the filter for winter? A: Drain completely, remove all plugs, and ensure no water remains in the tank or pipework. Never allow water to freeze inside the filter as this can crack the tank and voids the warranty.

Q: Is the multiport valve included? A: Yes, this kit includes the complete multiport valve, pressure gauge, and all necessary connections ready for installation.

Q: What are the plumbing connection sizes? A: Standard 1.5″ (50mm) BSP threaded connections with quick-connect barrel unions for easy installation.

📥 Downloads & Resources

📄 Lacron Filter Product Brochure – Complete specifications for all Lacron filter models

📄 Lacron Filter User Manual – Full installation, operation, and maintenance instructions

📄 Lacron Filter Technical Details – Detailed technical specifications and spare parts information

👍 Why Choose the Lacron 16″ Sureflow LSR

✅ Proven British Engineering – Manufactured by Waterco, the Lacron brand has been a trusted name in UK pool filtration for decades

✅ Premium GRP Construction – Glass reinforced polyester tank is UV stable, corrosion resistant, and built to last

✅ Complete Ready-to-Install Kit – Includes multiport valve, pressure gauge, and unions – no additional components needed

✅ Ideal for Compact Pools – Perfect capacity for pools up to 37,000 litres without oversizing

✅ Low Maintenance Design – Hydraulically balanced laterals and efficient backwash system minimise upkeep

✅ Comprehensive 5-Year Warranty – Waterco’s confidence in their product backed by industry-leading warranty coverage

✅ Salt Water Compatible – Suitable for both traditional and salt-chlorinated pools

✅ Energy Efficient – Optimised flow characteristics reduce pump workload and running costs

🤝 Why Buy From Parts4Tubs

✅ UK-Based Company – Local support from pool and spa specialists based in Northamptonshire

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

✅ Expert Technical Advice – Knowledgeable team to help with sizing, installation, and troubleshooting

✅ Competitive Pricing – Great value without compromising on quality or service

✅ Full Manufacturer Warranty – All warranty claims supported and processed efficiently

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

✅ Compatible Spares Available – Filter media, replacement parts, and accessories all in stock

✅ Trusted Supplier – Built on the success of buildahottub.com with years of industry experience

✨ Summary

The Lacron 16″ Sureflow LSR Side Mount Sand Filter delivers professional-grade filtration for residential pools up to 37,000 litres. Featuring robust GRP construction, an included 6-position multiport valve, and Waterco’s proven Sureflow technology, this complete kit provides everything needed for crystal clear pool water. Backed by a comprehensive 5-year tank warranty and designed for easy maintenance, the LSR-16 represents outstanding value for pool owners seeking reliable, long-lasting filtration performance.

Order today from Parts4Tubs and enjoy sparkling clean pool water all season long.