🌊 Certikin Lacron CL24TM 24″ Top Mount Sand Filter – Up to 85,000 Litre Pool Capacity

Powerful filtration performance for pristine swimming conditions all season long

💧 Product Overview

The Certikin Lacron CL24TM is a premium 24-inch top mount sand filter engineered for medium to large residential swimming pools. Built upon Waterco’s renowned Lacron Sureflow platform with over 30 years of proven industry performance, this high-capacity filtration system delivers exceptional water clarity for pools up to 85,000 litres.

Manufactured from heavy-duty glass reinforced polyester (GRP), the CL24TM features a high-gloss, non-corrosive tank construction that withstands the demands of both fresh and salt-water environments. The filter’s hydraulically balanced lateral system ensures optimal water distribution across the entire filter bed, maximising filtration efficiency whilst minimising operating pressure.

Supplied complete with a 6-way multiport valve and pressure gauge, this versatile filtration unit is designed for permanent in-ground residential pool installations. The generous 9-inch clear-view service lid provides quick visual inspection access, making routine maintenance straightforward and efficient.

⭐ Key Features

✅ 30 Years Proven Performance – Built on the trusted Lacron platform with an established industry reputation for reliability and effectiveness

✅ 14.5 m³/hr Flow Rate – High-capacity water throughput suitable for pools up to 85,000 litres with proper turnover

✅ Glass Reinforced Polyester Construction – Heavy-duty GRP tank material provides UV resistance and corrosion protection for extended service life

✅ 6-Way Multiport Valve Included – Complete control over filtration, backwash, rinse, waste, recirculate and closed functions

✅ 0.30 m² Filter Area – Generous filtration surface area for effective debris capture and extended run times between backwashes

✅ 125 kg Sand Media Capacity – Deep filter bed depth of 380mm ensures thorough particle removal down to 20-40 microns

✅ 9-Inch Clear-View Service Lid – Large transparent access lid allows visual inspection without disassembly

✅ Hydraulically Balanced Laterals – Engineered under-drain system maximises water flow distribution and filtration performance

✅ Quick-Connect Barrel Unions – Speed-style 1½” connections simplify installation and future servicing

✅ Easy-Access Winter Drain Tap – Purpose-designed drainage point for proper winterisation in UK climates

✅ Pressure Gauge Included – Built-in monitoring for optimal backwash timing and system health

✅ 5-Year Tank Warranty – Manufacturer confidence backed by comprehensive warranty coverage (1+4 years)

🔩 Technical Specifications

Specification	Value
Filter Type	Sand Filter (Top Mount)
Pool Capacity	Up to 85,000 litres
Flow Rate	14.5 m³/hr
Filter Area	0.30 m²
Filtration Rating	20-40 microns (sand) / 5-15 microns (glass media)
Tank Diameter	610 mm (24″)
Bed Depth	380 mm
Media Capacity	125 kg (sand) or 100 kg (glass)
Working Pressure	2.5 bar (36 psi) maximum
Test Pressure	4 bar (60 psi)
Inlet/Outlet Size	1½” (50 mm)
Tank Material	Glass Reinforced Polyester (GRP)
Valve Type	6-Way Multiport
Service Lid Size	9″ (230 mm) Clear View
Warranty	5 years tank (1+4), 1 year components

📐 Pool Sizing Guide

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

Formula:

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

Pool Size Compatibility

Pool Type	Volume Range	Suitability
🏊 Medium Above-Ground	30,000-50,000 L	Excellent – generous capacity headroom
🏊 Large Above-Ground	50,000-70,000 L	Very Good – optimal sizing match
🏠 Small In-Ground	Up to 50,000 L	Excellent – allows for high bather loads
🏠 Medium In-Ground	50,000-70,000 L	Very Good – ideal residential match
🏠 Large In-Ground	70,000-85,000 L	Good – suitable with 8-hour turnover

This Filter:

📍 Flow Rate: 14.5 m³/hr

📍 Suitable for pools up to: 85,000 litres

📍 Optimal range: 45,000 – 70,000 litres for best performance

🛠️ Installation Requirements

Plumbing Connections

Requirement	Specification
Inlet Connection	1½” (50 mm)
Outlet Connection	1½” (50 mm)
Valve Position	Top mount
Connection Type	Quick-connect barrel unions

Physical Installation

Requirement	Details
Base	Solid, level concrete slab or equivalent
Location	Close to pool, protected from flooding
Clearance Above	Minimum 500 mm for valve operation
Clearance Around	Minimum 300 mm for maintenance access
Orientation	Compliance label facing forward for identification

Pump Compatibility

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

• Recommended pump flow rate: 10 – 14.5 m³/hr
• Maximum pump flow rate: Do not exceed 14.5 m³/hr
• Pump head requirements: Consider total dynamic head including pipework losses

💡 Tip: Slightly undersizing the pump flow rate relative to filter capacity extends filter run times and reduces backwash frequency.

🔄 Maintenance Guide

Routine Maintenance Schedule

Task	Frequency	Procedure
Check pressure gauge	Weekly	Record baseline and monitor for increase
Backwash filter	When pressure rises 0.5 bar	Run until sight glass clears
Rinse after backwash	After each backwash	30-60 seconds to settle media
Inspect O-rings and seals	Seasonally	Replace if worn or cracked
Check media level	Annually	Top up if below recommended level
Full media replacement	Every 5-7 years (sand)	Replace with fresh 125 kg

Pressure Gauge Guide

📊 Clean filter baseline: Note reading after fresh backwash (typically 0.5-1.0 bar)

📊 Backwash required: When pressure rises 0.5 bar (50 kPa) above baseline

📊 Maximum safe operating: 2.5 bar – do not exceed

Backwashing Instructions

1. Switch off pump completely
2. Turn multiport valve handle to BACKWASH position
3. Switch on pump and run until sight glass shows clear water
4. Switch off pump
5. Turn valve to RINSE position
6. Run pump for 30-60 seconds
7. Switch off pump and return valve to FILTER position
8. Resume normal operation

Winterisation (UK Climate)

• Drain filter tank completely using winter drain tap
• Remove and store drain plug safely
• Position multiport valve between settings to release pressure
• Cover unit or relocate to frost-free storage if possible
• Never leave water in filter during freezing conditions – frost damage is not covered by warranty

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🪨 Filter Media Information

Compatible Media Types

Media Type	Filtration Rating	Lifespan	Key Benefits
Silica Sand (16/30 grade)	20-40 microns	5-7 years	Economical, proven performance
Glass Media (Lacronite)	5-15 microns	10+ years	Finer filtration, reduced backwash
ZeoSand (Zeolite)	3-5 microns	5 years	Superior clarity, ammonia removal

Media Capacity for CL24TM:

• Sand: 125 kg
• Glass Media: 100 kg

💡 Recommendation: Glass media such as Lacronite offers superior water clarity with less frequent backwashing, making it an excellent long-term investment despite higher initial cost.

Signs Media Needs Replacing

• Persistent poor water clarity despite correct water chemistry
• Increasingly short filter cycles between backwashes
• Visible media particles returning to pool
• Channelling or media compaction visible through service lid
• Filter pressure remains high even after thorough backwash

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✨ Filtration Performance

Performance Metric	Value
Filter Area	0.30 m²
Filtration Rating (Sand)	20-40 microns
Filtration Rating (Glass)	5-15 microns
Bed Depth	380 mm
Design Flow Rate	14.5 m³/hr

Micron Rating Explained

Rating	Particle Size	What It Removes
40+ microns	Visible debris	Leaves, insects, large particles
20-40 microns	Fine particles	Sand, dirt, most visible contamination
10-20 microns	Very fine	Smaller particles, some algae spores
5-10 microns	Microscopic	Very fine particles, most algae, improved clarity
3-5 microns	Ultra-fine	Near-crystal clarity, bacteria binding

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⚙️ Multiport Valve Positions & Functions

Position	Function	When to Use
FILTER	Normal filtration operation	Daily pool operation
BACKWASH	Reverse flow to clean media	When pressure rises 0.5 bar above baseline
RINSE	Settle media after backwash	30-60 seconds after every backwash
WASTE	Bypass filter to drain	Vacuuming heavy debris, lowering water level
RECIRCULATE	Bypass filter, return to pool	Chemical distribution, troubleshooting
CLOSED	Stop all water flow	Pump maintenance, winterisation

⚠️ Important: Always switch off pump before changing valve positions to prevent damage to valve seals.

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🏆 Ideal Applications

Application	Pool Volume	Notes
🏠 Residential Above-Ground	Up to 70,000 L	Excellent for larger above-ground installations
🏠 Residential In-Ground	Up to 85,000 L	Primary application – ideal domestic match
🏊 Indoor Pools	Up to 85,000 L	GRP construction suits humid environments
🌊 Saltwater Pools	Up to 85,000 L	Corrosion-resistant materials throughout
🏢 Small Commercial	See manual	May suit low-bather-load commercial applications

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❓ Frequently Asked Questions

Q: What size pool will this filter handle?

A: The CL24TM is suitable for pools up to 85,000 litres (85 m³) with its 14.5 m³/hr flow rate, achieving a full water turnover in approximately 6 hours.

Q: How often do I need to backwash?

A: Backwash when the pressure gauge reads 0.5 bar (7 psi) above your clean baseline reading. This typically occurs every 1-2 weeks depending on pool usage and debris load.

Q: What filter media should I use?

A: The filter accepts either 125 kg of 16/30 grade silica sand or 100 kg of glass media such as Lacronite. Glass media offers finer filtration (5-15 microns versus 20-40 microns) and longer service 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, making it more economical over time despite higher initial cost.

Q: What pump do I need?

A: Match with a pump delivering between 10-14.5 m³/hr flow rate at your system’s total dynamic head. Do not exceed the filter’s maximum 14.5 m³/hr rating. Popular compatible pumps include the Certikin Aquaspeed 0.75HP-1HP range.

Q: What warranty is included?

A: The Lacron filter includes a 5-year tank warranty (1 year full + 4 years pro-rata) and 1-year warranty on all other components including the multiport valve.

Q: Is this filter suitable for saltwater pools?

A: Yes. The GRP tank construction and non-corrosive components make this filter fully compatible with salt chlorinated pools.

Q: Can I use this filter with a heat pump?

A: Absolutely. The filter should be installed on the return line after the heat pump in the circulation system for optimal performance.

Q: What are the connection sizes?

A: The filter uses standard 1½” (50mm) connections via quick-connect barrel unions, compatible with most UK residential pool plumbing systems.

Q: How do I winterise this filter?

A: Drain completely using the winter drain tap, remove the drain plug for storage, and ensure no water remains in the tank. Frost damage from retained water is not covered by warranty.

📥 Downloads & Resources

📄 Installation Manual – Complete installation and operation guide

📄 Product Brochure – Full Lacron range specifications and features

🏆 Why Choose the Certikin Lacron CL24TM

✅ Proven Performance – Over 30 years of industry-leading reliability with more than a quarter million units installed across Britain

✅ Premium Construction – Heavy-duty glass reinforced polyester tank withstands demanding pool environments

✅ Optimal Capacity – 85,000 litre pool rating covers most residential in-ground installations

✅ Easy Maintenance – Clear-view service lid and intuitive multiport valve simplify routine care

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

✅ Comprehensive Warranty – 5-year tank warranty demonstrates manufacturer confidence

✅ Complete Package – Supplied ready to install with multiport valve and pressure gauge included

🤝 Why Buy from Parts4Tubs

✅ UK-based company with local customer support

✅ Fast UK delivery on pool filtration equipment

✅ Expert advice from pool and spa specialists

✅ Competitive pricing on Certikin products

✅ Full manufacturer warranty support

✅ Easy returns within 30 days

✅ Compatible filter media and spare parts available

✅ Built on the success of buildahottub.com

💧 Summary

The Certikin Lacron CL24TM delivers professional-grade sand filtration for residential pools up to 85,000 litres. With its robust GRP construction, 14.5 m³/hr flow capacity, and proven 30-year Lacron heritage, this 24-inch top mount filter represents outstanding value for medium to large domestic pool installations. Complete with 6-way multiport valve and pressure gauge, backed by a comprehensive 5-year tank warranty, the CL24TM is ready to keep your pool water crystal clear season after season. Order today for fast UK delivery.