🌊 Certikin Hydroswim EHS640V 25″ Side Mount Sand Filter – 90,000 Litre Pool Capacity

Superior filtration performance for pristine swimming conditions all season long.

💧 Product Overview

The Certikin Hydroswim EHS640V is a professional-grade 25″ side mount sand filter engineered to deliver outstanding water clarity for medium to large swimming pools. Built from high-quality laminated polyester reinforced with glass fibre, this robust filtration system offers exceptional durability and corrosion resistance for years of reliable service.

Featuring a powerful 15 m³/hr flow rate and 0.32 m² filtration area, the EHS640V efficiently handles pools up to 90,000 litres with a 6-hour turnover time. The convenient side mount design optimises installation flexibility and provides easy access for routine maintenance. Complete with a 6-way multiport valve, integrated pressure gauge, and manual air bleed system, this filter delivers everything you need for crystal-clear pool water.

Manufactured in a distinctive yellow colour with a large bolt-down lid for straightforward media access, the Hydroswim EHS640V combines practical functionality with professional-grade construction quality.

✨ Key Features

✅ Laminated Polyester Construction – Premium blend of polyester resin and glass fibre provides exceptional strength, corrosion resistance, and long-term durability

✅ 15 m³/hr Flow Rate – Powerful water throughput efficiently filters pools up to 90,000 litres with optimal turnover times

✅ 6-Way Multiport Valve – Complete control over filtration operations including filter, backwash, rinse, recirculate, waste, and closed positions

✅ 0.32 m² Filtration Area – Generous filter bed surface area ensures thorough particle capture and extended periods between backwashing

✅ Integrated Pressure Gauge – Monitor system performance at a glance to identify optimal backwash timing

✅ Manual Air Bleed System – Easily release trapped air to maintain peak filtration efficiency and prevent airlocks

✅ Large Bolt-Down Lid – Quick access to filter media for cleaning, inspection, and replacement

✅ Side Mount Configuration – Optimises space utilisation and simplifies plumbing connections with valve positioned at accessible height

✅ 1.5″ Connections – Standard inlet and outlet sizing compatible with common pool plumbing configurations

✅ 100 kg Sand Capacity – Substantial media volume for effective filtration and extended service intervals

✅ 2.5 Bar Maximum Pressure – Robust construction rated for demanding residential pool applications

✅ Internal Laterals Included – Complete filter assembly ready for installation with underdrain system fitted

🔧 Technical Specifications

Specification	Value
Filter Type	Sand Filter
Model Number	EHS640V
Pool Capacity	Up to 90,000 litres (6-hour turnover)
Flow Rate	15 m³/hr
Filtration Area	0.32 m²
Filtration Velocity	50 m³/h/m²
Filtration Rating	20-40 microns (standard sand media)
Tank Diameter	640 mm (25″)
Tank Height	905 mm
Height to Valve	442 mm
Sand Capacity	100 kg
Gravel Capacity	50 kg
Recommended Operating Pressure	0.5-1.6 bar
Maximum Working Pressure	2.5 bar
Test Pressure	4 bar (20,000 cycles)
Maximum Operating Temperature	50°C
Inlet/Outlet Size	1.5″ (38 mm)
Tank Material	Laminated Polyester (polyester resin & glass fibre)
Valve Type	6-way multiport (side mount)
Weight (Empty)	23 kg
Colour	Yellow

📏 Pool Sizing Guide

Sizing Principle:

The filter flow rate should turn over the entire pool volume within 6-8 hours for optimal water quality. Faster turnover times provide better filtration but require appropriately sized pumps.

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 – oversized for superior clarity
🏠 Medium above-ground	20,000-40,000 L	Excellent – ideal match with fast turnover
🏠 Large above-ground	40,000-60,000 L	Very Good – efficient 4-hour turnover
🏊 Small in-ground	Up to 50,000 L	Excellent – optimal sizing
🏊 Medium in-ground	50,000-75,000 L	Very Good – 5-hour turnover
🏊 Large in-ground	75,000-90,000 L	Good – 6-hour turnover

This Filter:

📍 Flow Rate: 15 m³/hr
📍 Suitable for pools up to: 90,000 litres (with 6-hour turnover)
📍 Optimal pool size: 45,000-75,000 litres (for 3-5 hour turnover)

🛠️ Installation Requirements

Plumbing:

Requirement	Specification
Inlet Connection	1.5″ (38 mm)
Outlet Connection	1.5″ (38 mm)
Valve Position	Side mount

Physical Installation:

Requirement	Details
Base	Solid, level concrete pad or paving required
Clearance Above	Minimum 300 mm for lid removal and media access
Clearance Around	Minimum 500 mm for valve operation and maintenance
Location	Well-ventilated area, protected from direct sunlight where possible

Pump Compatibility:

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

• Recommended pump flow rate: 10-15 m³/hr
• Minimum flow rate: 8 m³/hr (for adequate filtration)
• Maximum flow rate: 15 m³/hr (do not exceed filter rating)

💡 Tip: Oversizing the pump can force particles through the sand bed, reducing filtration efficiency. Match pump output to filter capacity for best results.

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🔄 Maintenance Guide

Routine Maintenance:

Task	When	How
Check pressure gauge	Weekly	Record baseline when filter is clean
Backwash	When pressure rises 0.5-1.0 bar above baseline	Run until sight glass runs clear (typically 2-3 minutes)
Rinse after backwash	After each backwash	30-60 seconds to settle sand bed
Inspect seals and O-rings	Seasonally	Replace if cracked, flattened, or leaking
Check sand level	Annually	Top up if more than 50 mm below normal level
Full media replacement	Every 5-7 years	Replace all sand and gravel completely

Pressure Gauge Guide:

📊 Clean filter baseline: 0.5-0.8 bar (record your specific baseline)
📊 Backwash needed: When pressure rises 0.5-1.0 bar above your baseline
📊 Maximum safe operating: 1.6 bar (recommended maximum)
📊 Never exceed: 2.5 bar (absolute maximum)

Winterisation (UK Climate):

• Backwash and rinse the filter thoroughly before closing
• Set multiport valve to “Winterise” position between settings if available
• Drain filter tank completely by removing drain plug
• Store drain plug safely to prevent refilling
• Leave valve handle in mid-position to prevent gasket compression
• Cover filter or store in frost-free location if possible
• Never leave water in filter tank during freezing conditions – ice expansion can crack the tank

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🪨 Filter Media Information

Compatible Media:

Media Type	Filtration Rating	Lifespan	Benefits
Silica Sand (#16-#20)	20-40 microns	5-7 years	Economical, widely available, proven performance
Glass Media	5-15 microns	10+ years	Finer filtration, longer life, requires less backwashing
ZeoSand/Zeolite	3-5 microns	5 years	Superior clarity, ammonia absorption
Filter Balls	10-15 microns	3-4 years	Lightweight, excellent flow, eco-friendly

Media Capacity: 100 kg sand + 50 kg gravel support bed

Media Installation Guide:

1. Add gravel layer first (50 kg) – this protects the laterals
2. Fill tank halfway with water to cushion sand
3. Add sand gradually (100 kg) – do not pour directly onto laterals
4. Level sand surface approximately 150 mm below tank rim

Signs Media Needs Replacing:

• Poor water clarity despite correct chemical balance
• Shortened filter cycles between backwashes
• Sand particles returning to pool through jets
• Channelling visible in sand bed (uneven settling)
• Filter more than 7 years old with original sand

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🔬 Filtration Performance

Metric	Value
Filtration Rating	20-40 microns (with sand media)
Filtration Area	0.32 m²
Filtration Velocity	50 m³/h/m²
Flow Rate	15 m³/hr

Micron Rating Guide:

Rating	What It Catches
40+ microns	Large debris, leaves, insects
20-40 microns	Sand, dirt, visible particles, hair
10-20 microns	Fine particles, some algae, pollen
5-10 microns	Very fine particles, most algae spores
Under 5 microns	Microscopic particles (requires DE or glass media)

💡 Performance Tip: Upgrade to glass filter media for filtration down to 5-15 microns without changing your filter – a simple media swap delivers significantly improved water clarity.

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⚙️ Valve Positions & Functions

Position	Function
Filter	Normal filtration – water flows through sand bed to pool
Backwash	Reverses flow to flush debris from sand to waste
Rinse	Settles sand bed and clears remaining debris after backwash
Waste	Bypasses filter, sends water directly to drain (for vacuuming heavy debris)
Recirculate	Bypasses filter, returns water to pool (for chemical distribution)
Closed	Stops all water flow through filter

Operating Tips:

⚠️ Always stop the pump before changing valve position – operating under pressure can damage the valve and gasket.

💡 After backwashing, always run “Rinse” for 30-60 seconds before returning to “Filter” mode to settle the sand bed and prevent debris returning to pool.

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🎯 Ideal Applications

Application	Pool Size	Suitability
🏠 Residential above-ground	Up to 60,000 L	Excellent – ideal primary filter
🏊 Residential in-ground	Up to 90,000 L	Excellent – optimal sizing
🏡 Large garden pools	60,000-90,000 L	Very Good – efficient turnover
🏨 Small holiday let pools	Up to 75,000 L	Good – robust for moderate use

Best Suited For:

• Medium to large residential swimming pools
• Above-ground pools requiring professional-grade filtration
• Installations where side-mount valve access is preferred
• Pool owners seeking reliable, low-maintenance filtration
• Upgrading from smaller or ageing filtration systems

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❓ Frequently Asked Questions

Q: What size pool will this filter handle?
A: The EHS640V is suitable for pools up to 90,000 litres with a 6-hour turnover time. For optimal performance with 4-hour turnover, ideal pool size is up to 60,000 litres.

Q: How often do I need to backwash?
A: Backwash when the pressure gauge reads 0.5-1.0 bar above your clean baseline reading. This is typically every 1-2 weeks during swimming season, but varies with pool usage, debris levels, and weather conditions.

Q: What filter media should I use?
A: The filter is compatible with silica sand (#16-#20 grade), glass media, zeolite, or filter balls. Standard capacity is 100 kg sand plus 50 kg gravel. Glass media offers finer filtration and longer life as an upgrade option.

Q: How long does filter media last?
A: Silica sand typically lasts 5-7 years, glass media 10+ years, and zeolite approximately 5 years. Replace sooner if you notice declining water clarity or shortened filter cycles.

Q: What pump do I need?
A: Match with a pump delivering 10-15 m³/hr. Popular compatible pumps include the Certikin Aquaspeed or similar 0.75-1.0 HP models. Do not exceed the filter’s 15 m³/hr maximum flow rate.

Q: Is this filter suitable for saltwater pools?
A: Yes, the laminated polyester construction provides excellent corrosion resistance suitable for saltwater chlorination systems.

Q: What’s included with the filter?
A: The EHS640V comes complete with the filter tank, internal laterals, 6-way multiport valve, pressure gauge, air bleed system, and large bolt-down lid. Filter media is not included and must be purchased separately.

Q: What’s the difference between side mount and top mount?
A: Side mount valves position the multiport at an accessible height on the side of the tank, whilst top mount valves sit directly on top. Side mount is often preferred for easier valve operation and lower overall height.

Q: Can I use this filter with a heat pump?
A: Yes, ensure your system flow rate meets the heat pump’s minimum requirement whilst not exceeding the filter’s 15 m³/hr maximum.

Q: What warranty is included?
A: Please contact Parts4Tubs for full warranty terms and conditions.

📥 Downloads & Resources

📄 Hydroswim Filter Brochure – Technical specifications and dimensions

🏆 Why Choose the Certikin Hydroswim EHS640V

✅ Professional-Grade Filtration – 15 m³/hr flow rate handles pools up to 90,000 litres efficiently

✅ Durable Construction – Laminated polyester reinforced with glass fibre for exceptional longevity and corrosion resistance

✅ Easy Maintenance – Large bolt-down lid, integrated pressure gauge, and simple backwash procedure

✅ Versatile Media Compatibility – Works with sand, glass, zeolite, or filter balls for customised filtration

✅ Complete Package – Arrives ready to install with valve, gauge, air bleed, and internal laterals included

✅ Established Brand – Certikin is a trusted name in UK pool equipment with decades of industry experience

✅ Practical Design – Side mount configuration provides convenient valve access and flexible installation options

✅ Rigorous Testing – Each unit pressure tested at 4 bar for 20,000 cycles ensuring reliable performance

🤝 Why Buy From Parts4Tubs

✅ UK-Based Company – Local support from pool specialists who understand UK pool requirements

✅ Fast UK Delivery – Quick dispatch to get your pool equipment when you need it

✅ Expert Advice – Technical guidance on filter sizing, pump matching, and installation

✅ Competitive Pricing – Great value on genuine Certikin products

✅ Full Warranty Support – Comprehensive coverage backed by local service

✅ Easy Returns – Hassle-free returns within 30 days if not completely satisfied

✅ Compatible Products Available – Filter media, spare parts, and replacement components in stock

✅ One-Stop Shop – Everything you need for your pool, hot tub, or spa from a single supplier

✨ Summary

The Certikin Hydroswim EHS640V delivers professional-grade sand filtration for residential pools up to 90,000 litres. With its robust laminated polyester construction, powerful 15 m³/hr flow rate, and convenient 6-way multiport valve, this 25″ side mount filter offers reliable, low-maintenance water clarity season after season. Complete with integrated pressure gauge, air bleed system, and internal laterals, the EHS640V arrives ready for installation. Order today from Parts4Tubs for fast UK delivery and expert support.