🌊 Lacron Finaflow ZZ3250NS 24″ Complete Sand Filter with Valve & Gauge

Ready-to-install deep bed filtration system for exceptional water clarity

💧 Product Overview

The Lacron Finaflow ZZ3250NS is the complete 24″ (610mm) deep bed sand filter system, supplied ready for installation with factory-fitted multiport valve and pressure gauge. Combining the proven Finaflow tank with all necessary valve components, this package eliminates the complexity of separate valve specification and delivers professional-grade filtration performance straight out of the box.

With a robust 13.5m³/h flow rate and signature deep bed technology providing a minimum 1-metre media depth, the ZZ3250NS captures finer particles and colloidal substances than standard shallow-bed filters. This extended contact time between water and media delivers noticeably clearer water with reduced chemical demand – the hallmark of Finaflow filtration that has made the range a favourite for pools and spas operating with warmer water and higher bather loads.

The complete package includes the GRP tank with side hatch, sight glass, and connecting unions, plus a 6-way multiport valve and integrated pressure gauge. This turnkey solution is ideal for pool owners and installers seeking the exceptional performance of Finaflow deep bed technology without the need to source and match separate components. Backed by Lacron’s 35+ year proven track record in the pool and spa industry, the ZZ3250NS represents the professional choice for medium-sized pools demanding superior water quality.

✨ Key Features

✅ Complete Ready-to-Install Package – Tank, 6-way multiport valve, and pressure gauge all included

✅ Deep Media Bed Technology – Minimum 1-metre filtration bed depth for superior particle capture

✅ 13.5m³/h Flow Rate – Suitable for pools up to 108,000 litres

✅ Glass Reinforced Polyester Construction – Extremely hard-wearing GRP tank with smooth high-gloss finish

✅ 6-Way Multiport Valve Included – Filter, backwash, rinse, waste, recirculate, and closed positions

✅ Integrated Pressure Gauge – Monitor filter condition for optimal backwash timing

✅ Side Hatch for Media Access – Rapid media removal for efficient maintenance and changes

✅ Media Sight Glass – Observe filter bed condition during operation and backwash cycles

✅ Clear Inspection Lid – Easy visual monitoring of media without system shutdown

✅ Connecting Unions Included – Simplifies installation with ready-to-connect pipework fittings

✅ 1.5″ (50mm) Connections – Standard sizing for domestic pool plumbing systems

✅ Pressure Tested to 4 Bar – Rigorous factory testing ensures reliable performance at 2.5 bar operating pressure

⚙️ Technical Specifications

Specification	Value
Model	ZZ3250NS
Filter Type	Deep Bed Sand Filter (Complete System)
Tank Diameter	24″ (610mm)
Flow Rate	13.5m³/h
Minimum Bed Depth	1 metre
Filtration Rating	20-40 microns (with sand media)
Test Pressure	4 bar
Maximum Working Pressure	2.5 bar
Connections	1.5″ (50mm)
Tank Material	Glass Reinforced Polyester (GRP)
Internal Finish	Smooth high-gloss
Valve Type	6-way side-mount multiport
Valve Included	Yes
Pressure Gauge	Yes – Included
Connecting Unions	Included
Air Vent	Manual
Water Drain	Manual
Inspection Lid	Clear
Media Sight Glass	Yes
Service Hatch	Yes
Filter Base	Included for stable floor mounting
Manufacturer	Lacron (Waterco Group)

📐 Pool Sizing Guide

The Lacron Finaflow ZZ3250NS delivers reliable filtration for medium to large residential pools and light commercial applications. Pool filtration systems should turn over the entire pool volume within 6-8 hours for optimal water quality.

Sizing Calculation:

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

Pool Size Compatibility:

Pool Type	Volume Range	Suitability
🏠 Medium In-Ground	50,000-80,000 L	✅ Excellent – optimal performance
🏠 Large In-Ground	80,000-108,000 L	✅ Very Good – 8-hour turnover
🏊 Large Above-Ground	40,000-70,000 L	✅ Excellent – premium filtration
🧖 Commercial Swim Spas	15,000-40,000 L	✅ Ideal – rapid turnover
🏨 Holiday Let Pools	Up to 80,000 L	✅ Excellent – reduced maintenance
🏢 Light Commercial	Up to 80,000 L	✅ Good – verify PWTAG compliance

This Filter:

📍 Flow Rate: 13.5m³/h
📍 Optimal Pool Size: Up to 81,000 litres (6-hour turnover)
📍 Maximum Pool Size: Up to 108,000 litres (8-hour turnover)

💡 Tip: The ZZ3250NS is the complete version of the FF24416 tank. If you already have a compatible valve, the tank-only option may suit your needs. For new installations, this complete package offers convenience and guaranteed component compatibility.

🔌 Installation Requirements

Complete Package Contents:

• 24″ (610mm) Finaflow deep bed tank with side hatch and sight glass
• 6-way side-mount multiport valve (pre-fitted or ready to fit)
• Pressure gauge
• Connecting unions
• Filter base for stable floor mounting

Plumbing Connections:

Requirement	Specification
Inlet Connection	1.5″ (50mm)
Outlet Connection	1.5″ (50mm)
Valve Position	Side mount
Union Type	Included connecting unions

Physical Installation:

Requirement	Details
Base	Solid, level concrete pad – filter base included for stability
Clearance Above	Minimum 600mm for lid removal and maintenance
Clearance Around	Minimum 500mm for service hatch and valve access
Location	Protect from direct sunlight where possible
Orientation	Ensure service hatch, sight glass, and valve are accessible

Pump Compatibility:

Parameter	Recommendation
Recommended Pump Flow	10.0 – 13.5m³/h
Maximum Pump Flow	Do not exceed 13.5m³/h
System Pressure	Must not exceed 2.5 bar during operation
Pump Connection	1.5″ pipework

💡 Installation Advantage: The ZZ3250NS arrives as a complete, matched system. No need to source separate valve components or worry about compatibility – simply connect to your pump and pool pipework.

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🧹 Maintenance Guide

Routine Maintenance Schedule:

Task	Frequency	Method
Check pressure gauge	Weekly	Note baseline reading when clean
Visual bed inspection	Weekly	Check through sight glass during operation
Backwash filter	When pressure rises 0.5-0.7 bar	Run until sight glass shows clear water
Rinse after backwash	After every backwash	60-90 seconds to settle media
Inspect valve seals	Seasonally	Replace if worn or leaking
Check media level	Annually	Top up if low via service hatch
Full media replacement	Every 5-7 years (sand)	Access via service hatch

Pressure Gauge Guide:

📊 Clean filter baseline: 0.8-1.2 bar (typical)
📊 Backwash recommended: 0.5-0.7 bar above baseline
📊 Maximum operating: 2.5 bar

Deep Bed Advantage: The 1-metre minimum bed depth provides significantly greater dirt-holding capacity than standard filters, meaning longer intervals between backwashes and reduced water wastage.

Using the Integrated Pressure Gauge: The included pressure gauge is your primary indicator for filter condition:

1. Note the pressure reading when the filter is freshly cleaned (baseline)
2. Monitor weekly – pressure will gradually increase as debris accumulates
3. When pressure rises 0.5-0.7 bar above baseline, it’s time to backwash
4. After backwash and rinse, pressure should return close to baseline

Winterisation (Essential for UK Climate):

1. Switch off pump and allow system to depressurise
2. Set multiport valve to “Winterise” position or between settings
3. Drain filter tank completely via manual drain
4. Open air vent to assist complete drainage
5. Remove and store drain plug safely
6. Leave multiport valve in intermediate position to prevent seal compression
7. Cover filter or relocate to frost-free storage if possible

⚠️ Critical: The deep media bed retains significant water. Ensure complete drainage before freezing conditions to prevent tank damage.

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🪨 Filter Media Information

The Lacron Finaflow ZZ3250NS’s deep bed design is optimised for use with specific filter media to achieve maximum performance.

Recommended Media Types:

Media Type	Size	Filtration Rating	Benefits
Lacronite (Zeolite)	As supplied	3-5 microns	Superior clarity, reduced chemicals, longer life
Filter Sand	0.5-1.4mm (16/30 grade)	20-40 microns	Economical, proven performance
Glass Media	0.5-1.0mm	5-15 microns	Finer filtration, eco-friendly

Media Capacity: Refer to manufacturer documentation or contact Parts4Tubs for specific media quantities for the ZZ3250NS.

💡 Lacronite Advantages: Lacron specifically recommends their Lacronite zeolite media which offers superior water clarity, remarkable dirt retention, reduced backwashing frequency, lower chemical costs, and improved bather comfort.

Signs Media Needs Replacing:

• Persistently cloudy water despite correct chemical balance
• Shortened filter cycles requiring frequent backwashing
• Visible media particles in pool returns
• Media channelling visible through sight glass
• Increased chemical consumption without improved clarity

Media Change Access: The ZZ3250NS features a dedicated service hatch for rapid media removal, significantly reducing maintenance time compared to filters requiring complete disassembly.

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🔬 Filtration Performance

Metric	Value
Filtration Rating (Sand)	20-40 microns
Filtration Rating (Lacronite)	3-5 microns
Design Flow Rate	13.5m³/h
Minimum Bed Depth	1 metre
Deep Bed Advantage	Enhanced particle capture and dirt retention

Micron Rating Guide:

Rating	What It Removes
40+ microns	Visible debris, leaves, large particles
20-40 microns	Sand, dirt, visible suspended particles
10-20 microns	Fine particles, some algae spores
5-10 microns	Very fine particles, most algae
3-5 microns	Near-invisible particles, colloidal matter

Deep Bed Filtration Advantage:

The Finaflow’s minimum 1-metre media bed depth delivers:

• Extended Contact Time – Water remains in contact with media longer, capturing finer particles
• Enhanced Dirt Retention – Greater media volume holds more dirt before backwashing
• Colloidal Particle Capture – Removes fine suspended matter that passes through shallow beds
• Improved Water Clarity – Noticeably clearer water, especially in warmer pools
• Reduced Chemical Demand – Cleaner water requires fewer treatment chemicals

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⚙️ Valve Positions & Functions

The included 6-way multiport valve provides complete control over all filtration and maintenance operations:

Position	Function	When to Use
Filter	Normal filtration mode	Daily operation – water flows through media and returns to pool
Backwash	Reverses flow to clean media	When pressure gauge rises 0.5-0.7 bar above baseline
Rinse	Settles media after backwash	60-90 seconds after every backwash cycle
Waste	Bypasses filter, drains to waste	Vacuuming heavy debris, lowering water level
Recirculate	Bypasses filter, returns to pool	Distributing chemicals, troubleshooting
Closed	Stops all water flow	Maintenance, winterisation

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

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🎯 Ideal Applications

Application	Pool Size	Suitability
🏠 Medium Residential In-Ground	50,000-80,000 L	✅ Excellent – ideal match
🏠 Large Residential In-Ground	80,000-108,000 L	✅ Very Good – 8-hour turnover
🏊 Premium Above-Ground	40,000-70,000 L	✅ Excellent
🧖 Commercial Swim Spas	15,000-40,000 L	✅ Ideal – rapid turnover
🏨 Holiday Rental Properties	Up to 80,000 L	✅ Excellent – low maintenance
🏢 Light Commercial	Up to 80,000 L	✅ Good – verify regulations
♨️ Warmer Water Pools	Various	✅ Specifically designed
🏊 High Bather Load Pools	Various	✅ Specifically designed

Particularly Recommended For:

• New pool installations requiring a complete, matched filtration system
• Pools and spas operating with warmer water temperatures
• Installations with higher bather loads requiring enhanced filtration
• Pool owners seeking superior water clarity with reduced chemical costs
• Replacement of complete filter systems
• Installers preferring guaranteed component compatibility
• DIY pool builders wanting a straightforward, complete solution

❓ Frequently Asked Questions

Q: What size pool will this filter handle? A: The ZZ3250NS is suitable for pools up to 108,000 litres with an 8-hour turnover, or optimally up to 81,000 litres with a 6-hour turnover.

Q: What’s included in the package? A: The ZZ3250NS includes the 24″ Finaflow deep bed tank with side hatch and sight glass, 6-way side-mount multiport valve, pressure gauge, connecting unions, and filter base. It’s a complete, ready-to-install system.

Q: What’s the difference between this and the FF24416? A: The FF24416 is the tank only version, while the ZZ3250NS is the complete package including valve and gauge. Both use the same 24″ Finaflow tank with identical filtration performance.

Q: How often do I need to backwash? A: Backwash when the pressure gauge reads 0.5-0.7 bar above your clean baseline. The deep bed design provides greater dirt-holding capacity, typically allowing longer intervals between backwashes.

Q: What filter media should I use? A: Lacron recommends either Lacronite (zeolite) for superior 3-5 micron filtration, or 16/30 grade sand (0.5-1.4mm) for standard 20-40 micron filtration. Glass media is also compatible.

Q: What is the advantage of the deep bed design? A: The minimum 1-metre media depth provides extended water contact time, capturing finer particles and colloidal substances that pass through shallow-bed filters. This results in noticeably clearer water and reduced chemical demand.

Q: Is this suitable for commercial use? A: The Finaflow range is designed for commercial and domestic pools, particularly those with warmer water and higher bather loads. For regulated commercial pools, verify compliance with PWTAG guidelines.

Q: What pump do I need? A: Pair with a pump delivering between 10.0-13.5m³/h through 1.5″ pipework. Never exceed the filter’s maximum flow rate.

Q: What warranty is included? A: Lacron products are backed by manufacturer warranty. Contact Parts4Tubs for full warranty terms and conditions.

🏆 Why Choose the Lacron Finaflow ZZ3250NS

✅ Complete Ready-to-Install System – Tank, valve, gauge, and unions all included

✅ Superior Deep Bed Filtration – 1-metre minimum bed depth captures finer particles

✅ Guaranteed Compatibility – Factory-matched components eliminate specification guesswork

✅ Commercial-Grade Construction – GRP tank with smooth high-gloss finish built to last

✅ Proven Performance – Lacron’s 35+ year track record of reliability

✅ Enhanced Water Clarity – Deep bed technology removes colloidal particles

✅ Reduced Maintenance – Greater dirt capacity means longer backwash intervals

✅ Easy Servicing – Service hatch, sight glass, and integrated gauge simplify maintenance

✅ Ideal for New Installations – Turnkey solution for pool builders and DIY installers

✅ Lower Running Costs – Reduced chemical demand and backwash frequency save money

🛒 Why Buy From Parts4Tubs

✅ UK-Based Company – Local support and expertise you can rely on

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

✅ Expert Advice – Our team understands pool filtration and can help with sizing, pump matching, and installation queries

✅ Competitive Pricing – Great value on genuine Lacron equipment

✅ Full Warranty Support – We stand behind every product we sell

✅ Easy Returns – Hassle-free 30-day returns policy

✅ Complete Range – Filter media, spare parts, pumps, and accessories all available

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

💦 Summary

The Lacron Finaflow ZZ3250NS is the complete 24″ (610mm) deep bed sand filter system, delivered ready for installation with factory-matched 6-way multiport valve, pressure gauge, and connecting unions. Featuring a robust 13.5m³/h flow rate and minimum 1-metre media bed depth, this filter captures finer particles and colloidal substances for exceptional water clarity in pools up to 108,000 litres. The commercial-grade GRP construction, service hatch, sight glass, and included valve make this a turnkey solution for new installations, replacement systems, and pool builders seeking guaranteed component compatibility. Backed by Lacron’s 35+ year industry reputation, the ZZ3250NS delivers professional-grade deep bed filtration performance in one convenient, complete package.