🌊 Certikin Lacron CL24 24″ Sand Pool Filter – 85,000 Litre Capacity

Powerful filtration technology for pristine swimming conditions, season after season

📋 Product Overview

The Certikin Lacron CL24 is a professional-grade 24″ top-mounted sand filter engineered for domestic swimming pools requiring reliable, high-capacity filtration. Part of the renowned Lacron range with over 30 years of proven performance in the UK pool industry, this filter delivers exceptional water clarity through efficient depth filtration technology.

Constructed from premium-grade fiberglass reinforced plastic (FRP), the CL24 features a high-gloss, non-corrosive tank designed to withstand harsh pool chemical environments whilst maintaining its aesthetic appeal. The 14.5 m³/hr flow rate efficiently handles pools up to 85,000 litres, making it ideal for medium to large residential installations. With its 9″ clear-view service lid, energy-efficient internal pipework, and easy-access winter drain, the CL24 combines performance with practical maintenance features that pool owners genuinely appreciate.

✨ Key Features

• ✅ 30-Year Proven Track Record – Part of the established Lacron filter range trusted by pool professionals across the UK
• ✅ 14.5 m³/hr Flow Rate – Powerful circulation handles pools up to 85,000 litres efficiently
• ✅ High-Gloss FRP Construction – Non-corrosive fiberglass reinforced plastic tank resists UV damage and chemical degradation
• ✅ 9″ Clear-View Service Lid – Large transparent access lid enables quick visual inspections and easy media loading
• ✅ 1.5″ Top-Mount Multiport Valve – Six-position valve with sight glass for effortless operation and backwash monitoring
• ✅ Pressure Gauge Included – Monitor filter performance and know exactly when backwashing is required
• ✅ Energy-Efficient Pipework – Optimised internal distribution system minimises energy consumption
• ✅ Speed-Style Connections – Quick-connect barrel unions simplify installation and servicing
• ✅ Winter Drain Tap – Easy-access drain protects your investment during freezing conditions
• ✅ Hydraulically Balanced Laterals – Maximises water flow and ensures even filtration across the entire media bed
• ✅ 5-Year Tank Warranty – Manufacturer confidence backed by comprehensive warranty coverage

🔩 Technical Specifications

Specification	Value
Filter Type	Sand Filter (Top Mount)
Model Number	CL24
Pool Capacity	Up to 85,000 litres
Flow Rate	14.5 m³/hr
Filter Area	0.30 m²
Filtration Rating	20-40 microns (standard sand)
Tank Diameter	24″ (610 mm)
Media Capacity	125 kg silica sand
Working Pressure	2.5 bar (36 psi)
Test Pressure	4 bar (60 psi)
Inlet/Outlet Size	1.5″ (50 mm)
Tank Material	FRP (Fiberglass Reinforced Plastic)
Valve Type	6-Position Top-Mount Multiport
Service Lid	9″ (229 mm) Clear View
Warranty – Tank	5 years (1 year full + 4 years pro-rata)
Warranty – Components	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.

Formula:

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

Pool Size Compatibility:

Pool Type	Volume Range	Suitability
🏠 Medium above-ground	20,000-40,000 L	✅ Excellent – provides ample filtration capacity
🏠 Large above-ground	40,000-60,000 L	✅ Excellent – ideal match for flow rate
🏊 Small in-ground	Up to 50,000 L	✅ Excellent – achieves 6-hour turnover
🏊 Medium in-ground	50,000-85,000 L	✅ Good – achieves 6-8 hour turnover
🏊 Large in-ground	85,000+ L	⚠️ Consider larger filter model

This Filter:

📍 Flow Rate: 14.5 m³/hr 📍 Suitable for pools up to: 85,000 litres (with 6-hour turnover) 📍 Optimal range: 40,000-70,000 litres for best performance

🛠️ Installation Requirements

Plumbing:

Requirement	Specification
Inlet Connection	1.5″ (50 mm)
Outlet Connection	1.5″ (50 mm)
Valve Position	Top mount
Connection Type	Speed-style barrel unions

Physical Installation:

Requirement	Details
Base	Solid, level concrete slab or equivalent
Clearance above	Minimum 500 mm for valve operation
Clearance around	Minimum 300 mm for maintenance access
Location	Away from flooding risk, accessible for servicing

Pump Compatibility:

⚠️ The 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
• Suggested pumps: Certikin Aquaspeed 0.75HP to 1HP, or equivalent

💡 Tip: Undersizing the pump slightly extends filter cycles between backwashes whilst maintaining excellent water clarity.

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🔄 Maintenance Guide

Routine Maintenance:

Task	When	How
Check pressure gauge	Weekly	Normal operating: 0.5-1.0 bar
Backwash	When pressure rises 0.5 bar above baseline	Run until sight glass clears (2-3 minutes)
Rinse after backwash	After each backwash	30-60 seconds until water runs clear
Inspect valve seals	Seasonally	Replace if worn or cracked
Check media level	Annually	Top up if below recommended level
Full media change	Every 5-7 years (sand)	Replace media completely

Pressure Gauge Guide:

📊 Clean filter baseline: 0.5-0.8 bar 📊 Backwash required: 1.0-1.3 bar (0.5 bar above baseline) 📊 Maximum safe operating: 2.5 bar

Winterisation (UK Climate):

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

• Drain filter tank completely using the winter drain tap
• Remove and store drain plug safely
• Set multiport valve to “Winterise” position (between Filter and Waste)
• Drain all connected pipework
• Cover or store in frost-free location if possible
• Never leave water in the filter during freezing conditions

🪨 Filter Media Information

Compatible Media:

Media Type	Filtration	Lifespan	Benefits
Silica Sand (16/30 grade)	20-40 microns	5-7 years	Economical, proven performance
Glass Media	5-15 microns	10+ years	Finer filtration, longer life, eco-friendly
ZeoSand	3-5 microns	5 years	Superior clarity, ammonia reduction
Lacronite Glass	5-15 microns	10+ years	Certikin’s own premium glass media

Media Capacity: 125 kg

💡 Tip: When using glass media instead of sand, you typically need 15-20% less by weight to fill the same filter.

Signs Media Needs Replacing:

• Poor water clarity despite correct chemical balance
• Short filter cycles between backwashes
• Cloudy water returns to pool after filtering
• Sand or media appearing in pool
• Filter unable to hold pressure

🔬 Filtration Performance

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

Micron Rating Guide:

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

💡 Upgrade Tip: Switching from standard sand to glass media can improve filtration from 20-40 microns down to 5-15 microns without changing the filter itself.

⚙️ Valve Positions & Functions

The 6-position multiport valve provides complete control over your filtration system:

Position	Function
Filter	Normal filtration – water flows through media to pool
Backwash	Reverse flow cleans media, debris exits via waste line
Rinse	Settles media after backwash, prevents dirty water entering pool
Waste	Bypass filter, send water directly to drain (for vacuuming heavy debris)
Recirculate	Bypass filter, return water to pool (for chemical distribution)
Closed	Stop all water flow (for pump servicing only – never run pump in this position)

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

🎯 Ideal Applications

Application	Pool Size	Notes
🏠 Residential above-ground	20,000-60,000 L	Excellent choice for family pools
🏠 Residential in-ground	30,000-85,000 L	Ideal for most domestic in-ground pools
🏡 Holiday home/rental	Up to 70,000 L	Reliable performance with minimal maintenance
🏊 Swim spa	Up to 15,000 L	More than adequate capacity

❓ Frequently Asked Questions

Q: What size pool will this filter handle? A: The CL24 is suitable for pools up to 85,000 litres, providing a complete water turnover every 6-8 hours with its 14.5 m³/hr flow rate. For optimal performance, we recommend pools between 40,000-70,000 litres.

Q: How often do I need to backwash? A: Backwash when the pressure gauge reads approximately 0.5 bar above your clean baseline pressure. This is typically every 1-2 weeks during swimming season, though frequency varies based on pool usage and debris load.

Q: What filter media should I use? A: The CL24 is compatible with 16/30 grade silica sand (125 kg required), glass media, Lacronite, or ZeoSand. Glass media offers finer filtration and longer lifespan if you want to upgrade from standard sand.

Q: How long does filter media last? A: Standard silica sand lasts 5-7 years with proper maintenance. Glass media can last 10+ years. Regular backwashing and proper chemical balance extend media life.

Q: What pump do I need? A: Match with a pump delivering 10-14.5 m³/hr. Popular compatible options include the Certikin Aquaspeed 0.75HP or 1HP. Never exceed the filter’s maximum flow rate of 14.5 m³/hr.

Q: What warranty is included? A: The Lacron CL24 comes with a 5-year tank warranty (1 year full coverage + 4 years pro-rata) and 1-year warranty on all other components including the valve.

Q: Is this filter suitable for salt chlorinated pools? A: Yes, the FRP (fiberglass reinforced plastic) construction is fully compatible with salt chlorination systems.

Q: What maintenance does the filter require? A: Weekly pressure gauge checks, backwashing when needed (typically every 1-2 weeks), annual media level inspection, and proper winterisation. The clear-view lid makes inspections quick and easy.

Q: Can I use this with my existing pipework? A: The CL24 uses standard 1.5″ (50mm) connections with speed-style barrel unions, compatible with most domestic pool plumbing systems.

📥 Downloads & Resources

📄 Installation Manual – Complete installation and operating instructions

📄 Product Brochure – Full Lacron range specifications and features

🏆 Why Choose the Certikin Lacron CL24

• ✅ Proven Performance – Over 30 years of Lacron filters trusted by UK pool professionals
• ✅ Superior Build Quality – Premium FRP construction with high-gloss corrosion-resistant finish
• ✅ Efficient Filtration – 0.30 m² filter area delivers excellent water clarity
• ✅ Easy Maintenance – 9″ clear-view lid and winter drain simplify routine care
• ✅ Versatile Sizing – Perfect for pools from 40,000 to 85,000 litres
• ✅ Comprehensive Warranty – 5-year tank warranty demonstrates manufacturer confidence
• ✅ UK Climate Ready – Winter drain tap protects against frost damage
• ✅ Value for Money – Professional-grade performance at a competitive price point

🤝 Why Buy from Parts4Tubs

• ✅ UK-Based Company – Local support from our Northamptonshire headquarters
• ✅ Fast UK Delivery – Quick dispatch on in-stock items
• ✅ Expert Advice – Pool and spa specialists available to help with sizing and compatibility
• ✅ Competitive Pricing – Great value on genuine Certikin products
• ✅ Full Warranty Support – We handle warranty claims directly
• ✅ Easy Returns – 30-day return policy for peace of mind
• ✅ Complete Range – Filter media, spare parts, and accessories all available

💧 Summary

The Certikin Lacron CL24 delivers professional-grade filtration for residential pools up to 85,000 litres. With its robust FRP construction, 14.5 m³/hr flow rate, and user-friendly maintenance features including the 9″ clear-view service lid and easy-access winter drain, this filter offers the perfect balance of performance and practicality. Backed by a 5-year tank warranty and Certikin’s 30-year reputation for quality, the CL24 is an excellent investment for clear, healthy pool water season after season.