🌊 Lacron Sureflow LSC-42 Commercial Side Mount Filter Tank Only (3″ / 90mm Connections)

Heavy-duty commercial filtration for pools demanding exceptional water clarity and reliability

💧 Product Overview

The Lacron Sureflow LSC-42 is a professional-grade commercial sand filter tank specifically engineered for light to medium commercial swimming pool installations. Manufactured by Waterco under the renowned Lacron brand, this 42-inch (1100mm) diameter filter delivers outstanding filtration performance with a flow rate of 29 m³/h and 0.97 m² of filter area.

Built from extremely hard-wearing glass reinforced polyester (GRP), the LSC-42 features a smooth high-gloss internal and external finish that ensures free water flow and easy cleaning. The tank is rigorously tested to 4 bar pressure, providing confident operation at a maximum working pressure of 2.5 bar. Inside, all internal parts and pipework are upgraded to the highest commercial standard, ensuring long service life and minimal maintenance requirements.

This commercial-grade filter is supplied as a tank only unit with connecting unions, designed for integration with separately purchased multiport valves and commercial plumbing systems. The LSC-42 is ideal for hotel pools, leisure centre facilities, school pools, holiday parks, and private pools requiring commercial-specification equipment.

⭐ Key Features

✅ Commercial-Grade GRP Construction – Glass reinforced polyester tank provides exceptional durability with corrosion and UV resistance for years of reliable service

✅ High Flow Capacity – 29 m³/h flow rate at 30 m³/hr/m² loading handles pools up to 232,000 litres with standard 8-hour turnover

✅ Large Filter Area – 0.97 m² filter area delivers superior dirt-holding capacity and extended filtration cycles between backwashes

✅ 550mm Bed Depth – Optimised media bed depth ensures thorough filtration and efficient backwashing performance

✅ 3-Inch Commercial Connections – 90mm inlet and outlet connections suit commercial plumbing systems and high-flow multiport valves

✅ Pressure Tested to 4 Bar – Rigorous factory testing guarantees safe operation at maximum 2.5 bar working pressure

✅ Inflow Diffuser System – Evenly distributes incoming water across the entire filter bed for uniform filtration

✅ Hydraulically Balanced Laterals – Engineered underdrain system maximises water flow and ensures complete media utilisation

✅ Integrated Water Drain – Built-in drainage point simplifies winterisation and maintenance procedures

✅ Extra-Large Filter Base – Oversized base provides exceptional stability on the plant room floor

✅ High-Gloss Interior Finish – Smooth gelcoat surface prevents debris accumulation and simplifies cleaning

✅ 5-Year Tank Warranty – Manufacturer’s warranty demonstrates confidence in build quality and longevity

🔧 Technical Specifications

Specification	Value
Filter Type	Sand Filter (Tank Only)
Tank Diameter	1100 mm (42 inches)
Bed Depth	550 mm
Filter Area	0.97 m²
Flow Rate	29 m³/h (@ 30 m³/hr/m² loading)
Sand Media Capacity	450 kg
Gravel Base Capacity	100 kg (deduct from sand if used)
Glass Media Capacity	350 kg
Test Pressure	4 bar
Maximum Working Pressure	2.5 bar
Inlet/Outlet Connections	90 mm (3 inches)
Tank Material	Glass Reinforced Polyester (GRP)
Overall Height (L)	1570 mm
Tank Height (B)	1086 mm
Tank Body (C)	1100 mm
Base Height (K)	740 mm
Weight (Empty)	102 kg
Product Code	1552250042
Warranty	5 years tank (1+4), 1 year other components

📐 Pool Sizing Guide

The Lacron LSC-42’s 29 m³/h flow rate makes it suitable for commercial and large residential pools requiring professional-grade filtration.

Sizing Principle: Pool water should pass through the filter system once every 6-8 hours (turnover time). Commercial installations typically require faster turnover times than residential pools.

Formula:

Maximum Pool Volume = Flow Rate × Turnover Time
29 m³/h × 8 hours = 232 m³ (232,000 litres)
29 m³/h × 6 hours = 174 m³ (174,000 litres)

Pool Size Compatibility:

Pool Type	Volume Range	Suitability
🏠 Large residential in-ground	80,000 – 150,000 L	✅ Excellent – generous capacity
🏢 Small commercial	100,000 – 175,000 L	✅ Ideal application
🏨 Hotel/leisure pools	150,000 – 200,000 L	✅ Recommended
🏫 School/training pools	175,000 – 232,000 L	✅ Suitable with 8-hour turnover
🌊 Large commercial	200,000+ L	⚠️ Consider LSC-48 or multiple units

This Filter:

📍 Flow Rate: 29 m³/h
📍 Filter Area: 0.97 m²
📍 Suitable for pools up to: 232,000 litres (8-hour turnover)
📍 Optimal for pools: 150,000 - 200,000 litres (commercial turnover rates)

🛠️ Installation Requirements

Important: Tank Only Product

This filter is supplied as tank only with connecting unions. You will need to separately purchase:

• Commercial multiport valve (3-inch / 90mm)
• Pressure gauge
• Face pipework kit (if required)
• Filter media (sand, glass, or zeolite)

Plumbing Requirements

Requirement	Specification
Inlet Connection	90 mm (3 inches)
Outlet Connection	90 mm (3 inches)
Valve Position	Side mount
Connection Type	Union fittings supplied

Physical Installation

Requirement	Details
Base	Solid, level concrete or reinforced surface required
Floor Loading	Consider 550+ kg when filled with media and water
Clearance Above	Minimum 600 mm for lid removal and media access
Clearance Around	Minimum 500 mm for maintenance access
Location	Indoor plant room recommended for commercial installations

Pump Compatibility

⚠️ The filter must be matched with an appropriate commercial pump.

Recommended pump flow rate: 20 - 29 m³/h
Pump must not exceed filter's maximum flow rate of 29 m³/h
Ensure pump head pressure does not exceed 2.5 bar at filter

For commercial installations, consult a qualified pool engineer
to ensure correct pump/filter matching.

🔄 Maintenance Guide

Routine Maintenance

Task	Frequency	Procedure
Check pressure gauge	Weekly	Record baseline and monitor increases
Backwash filter	When pressure rises 0.5-0.7 bar above clean	Run until sight glass clears (typically 3-5 minutes)
Rinse after backwash	After each backwash	Run for 30-60 seconds to settle media
Inspect tank seals	Seasonally	Check lid O-ring and connection seals
Check media level	Annually	Top up if media level has dropped
Full media replacement	Every 5-10 years	Complete media change (see media section)

Pressure Gauge Guide

📊 Clean filter baseline: Note pressure after fresh backwash
📊 Backwash indicator: 0.5-0.7 bar above baseline
📊 Maximum safe operating: 2.5 bar
📊 Never operate above: 2.5 bar (maximum working pressure)

Backwash Frequency Guidelines

Installation Type	Typical Backwash Frequency
Commercial pools (high bather load)	Daily
Hotel/leisure pools	Every 2-3 days
School pools	Every 3-5 days
Large residential pools	Weekly

Winterisation (UK Climate)

For seasonal pools or during extended closure periods:

1. Set multiport valve to closed position
2. Switch off circulation pump and isolate electrically
3. Remove filter tank drain plug to drain all water
4. Leave drain plug removed to prevent trapped water freezing
5. If possible, remove and store multiport valve indoors
6. Cover filter tank or store in frost-free location
7. Never leave water standing in filter during freezing conditions

⚠️ Important: Water trapped in the filter tank can freeze and cause irreparable damage to the GRP shell. Proper winterisation is essential for UK installations.

🪨 Filter Media Information

Compatible Media Types

Media Type	Filtration Rating	Capacity	Lifespan	Benefits
Silica Sand (16/30 grade)	20-40 microns	450 kg	5-10 years	Economical, proven performance
Glass Media	5-15 microns	350 kg	10+ years	Finer filtration, lower backwash water use
Zeolite (Lacronite)	3-5 microns	350 kg	5-7 years	Superior clarity, ammonia removal

Media Loading Notes

• Sand only: 450 kg of 16/30 grade silica sand (0.5-1.4mm)
• Sand with gravel base: Deduct gravel weight from sand capacity (e.g., 100 kg gravel + 350 kg sand)
• Glass media: 350 kg capacity provides equivalent filtration to sand with improved performance
• Commercial recommendation: Pea gravel base layer (50-100mm depth) aids water distribution during backwash

Signs Media Needs Replacing

• Reduced water clarity despite correct chemical balance
• Short filter cycles requiring frequent backwashing
• Increased normal operating pressure (10%+ above original baseline)
• Visible channelling or media clumping
• Media passing back to pool through returns
• Difficulty maintaining water chemistry balance

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🔬 Filtration Performance

Performance Metric	Value
Filter Area	0.97 m²
Design Flow Rate	29 m³/h
Loading Rate	30 m³/hr/m²
Bed Depth	550 mm

Filtration Capability by Media Type

Media	Micron Rating	What It Removes
Silica Sand	20-40 microns	Visible debris, leaves, hair, larger particles
Glass Media	5-15 microns	Fine particles, some algae, improved clarity
Zeolite	3-5 microns	Very fine particles, chloramines, most algae

Commercial Performance Notes

The LSC-42 filter operates at a design loading rate of 30 m³/hr/m², which is within accepted parameters for light to medium commercial applications. For heavily loaded pools (public leisure centres, water parks), consider:

• Faster backwash cycles
• Premium filter media (glass or zeolite)
• Pre-filtration with MultiCyclone units
• Multiple filter arrangements

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⚙️ Multiport Valve Functions (Separate Purchase Required)

When paired with a compatible 3-inch commercial multiport valve, the following functions are typically available:

Position	Function
Filter	Normal filtration – water flows through media to pool
Backwash	Reverse flow cleans media – discharge to waste
Rinse	Settles media after backwash – brief cycle to waste
Waste	Bypasses filter media – direct to waste drain
Recirculate	Bypasses filter – returns directly to pool
Closed	Stops all water flow through valve
Winter	Relieves pressure for winterisation

⚠️ Note: Multiport valve functions may vary by manufacturer. Always refer to valve documentation for specific operation instructions.

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🏢 Ideal Applications

Application	Pool Size	Suitability
🏨 Hotel pools	100,000 – 200,000 L	✅ Excellent choice
🏫 School/college pools	150,000 – 230,000 L	✅ Ideal application
🏢 Corporate wellness facilities	80,000 – 150,000 L	✅ Generous capacity
🏊 Swim schools	100,000 – 180,000 L	✅ Handles high bather loads
🏡 Large private residences	80,000 – 150,000 L	✅ Commercial-grade reliability
🏕️ Holiday parks	150,000 – 200,000 L	✅ Robust construction
🏥 Hydrotherapy pools	50,000 – 100,000 L	✅ Premium filtration capacity

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❓ Frequently Asked Questions

Q: What size pool will this filter handle? A: The LSC-42 with its 29 m³/h flow rate is suitable for pools up to 232,000 litres with an 8-hour turnover, or up to 174,000 litres with a 6-hour commercial turnover. It’s ideally suited to pools between 150,000 and 200,000 litres.

Q: Is a multiport valve included? A: No, the LSC-42 is supplied as a tank only unit with connecting unions. You will need to purchase a 3-inch (90mm) commercial multiport valve separately, along with a pressure gauge and any required pipework.

Q: How much filter media do I need? A: The LSC-42 requires 450 kg of silica sand (16/30 grade) for sand filtration, or 350 kg of glass media. If using a pea gravel base layer (recommended for commercial installations), deduct the gravel weight from the sand capacity.

Q: How often should I backwash? A: For commercial pools with high bather loads, daily backwashing is typical. For hotel and leisure pools, every 2-3 days is common. Monitor your pressure gauge – backwash when pressure rises 0.5-0.7 bar above the clean baseline reading.

Q: What pump do I need? A: Match with a commercial pump delivering between 20-29 m³/h. The pump’s flow rate must not exceed the filter’s maximum of 29 m³/h, and operating pressure should not exceed 2.5 bar at the filter.

Q: How long does the filter media last? A: Silica sand typically lasts 5-10 years in commercial applications (less with very high bather loads). Glass media can last 10+ years. Zeolite typically requires replacement every 5-7 years.

Q: What is the warranty? A: Waterco provides a 5-year warranty on the GRP tank (1 year full, 4 years pro-rata) and 1 year on other components. Contact Parts4Tubs for full warranty terms and conditions.

Q: Can I use glass media instead of sand? A: Yes, glass media is fully compatible with the LSC-42 and offers finer filtration (5-15 microns versus 20-40 microns for sand), reduced backwash water consumption, and longer service life. Capacity is 350 kg.

Q: What connections does this filter have? A: The LSC-42 features 3-inch (90mm) connections suitable for commercial plumbing systems and high-flow multiport valves.

Q: Is this filter suitable for saltwater pools? A: Yes, the GRP construction is corrosion-resistant and suitable for both freshwater and saltwater pool installations.

📥 Downloads & Resources

📄 Lacron Sureflow LSC Datasheet – Technical specifications and dimensions

🏆 Why Choose the Lacron Sureflow LSC-42

✅ Proven Commercial Performance – Lacron filters have over 35 years of proven service in the UK pool industry, trusted by commercial operators nationwide

✅ Heavy-Duty GRP Construction – The glass reinforced polyester tank delivers exceptional durability with corrosion and UV resistance for demanding commercial environments

✅ High Flow Capacity – 29 m³/h flow rate handles large commercial pools up to 232,000 litres with confidence

✅ Generous Filter Area – 0.97 m² provides excellent dirt-holding capacity, extending periods between backwashes

✅ Commercial-Grade Internals – Upgraded internal pipework and hydraulically balanced laterals ensure long service life with minimal maintenance

✅ Flexible Media Options – Compatible with sand, glass media, and zeolite for optimised filtration performance

✅ 5-Year Tank Warranty – Manufacturer-backed warranty demonstrates confidence in build quality and longevity

✅ UK Technical Support – Backed by Waterco Europe’s UK-based technical team and nationwide dealer network

🤝 Why Buy from Parts4Tubs

✅ UK-based company with local customer support and technical assistance

✅ Competitive pricing on Lacron commercial filter equipment

✅ Fast UK delivery with tracked shipping options

✅ Expert advice from experienced pool equipment specialists

✅ Full warranty support – we handle warranty claims directly with Waterco

✅ Easy returns within 30 days if you change your mind

✅ Complete range of compatible multiport valves, filter media, and spare parts

✅ Trade accounts available for pool professionals and installers

💫 Summary

The Lacron Sureflow LSC-42 is a professional-grade commercial sand filter tank delivering exceptional performance for pools up to 232,000 litres. With its robust GRP construction, 29 m³/h flow rate, 0.97 m² filter area, and 5-year tank warranty, the LSC-42 represents a reliable, long-term filtration solution for hotels, schools, leisure facilities, and large private pools. Supplied as tank only with 3-inch connections, it integrates seamlessly with commercial multiport valves and professional plumbing systems. Order today from Parts4Tubs for fast UK delivery and expert support.