🌊 Certikin Hydroswim EHS520V 20″ Side Mount Sand Filter – Up to 80,000 Litre Pool Capacity

Superior filtration performance for pristine swimming conditions all season long

💧 Product Overview

The Certikin Hydroswim EHS520V is a high-quality 20-inch side mount sand filter designed to deliver crystal clear pool water for domestic swimming pools. Manufactured using durable laminated polyester reinforced with glass fibre, this robust filtration system combines reliable performance with straightforward operation.

Featuring a 10 m³/hr flow rate and 0.21 m² filtration area, the EHS520V is ideally suited for above-ground and smaller in-ground pools up to approximately 80,000 litres. The integrated 6-way multiport valve provides complete control over filtration, backwashing, rinsing, and drainage functions, whilst the included pressure gauge enables easy monitoring of filter performance.

Built to withstand demanding pool environments, the Hydroswim range has been tested to 4 bar pressure over 20,000 cycles, ensuring long-lasting durability. The distinctive yellow tank and side-mounted valve configuration make this filter a practical choice for pool owners seeking dependable water clarity without complicated maintenance routines.

⭐ Key Features

✅ Sand Filtration Technology – Proven sand media filtration removes particles down to 20-40 microns for consistently clear water

✅ 10 m³/hr Flow Rate – Sufficient capacity to filter pools up to 80,000 litres with an 8-hour turnover

✅ Laminated Polyester Construction – Reinforced with glass fibre for excellent durability and corrosion resistance

✅ 6-Way Multiport Valve – Complete control with filter, backwash, rinse, recirculate, waste, and closed positions

✅ Side Mount Configuration – Easy access for valve operation and maintenance in various installation scenarios

✅ Integrated Pressure Gauge – Monitor system performance at a glance to know when backwashing is required

✅ Manual Air Bleed System – Expel trapped air from the tank to maintain optimal filtration efficiency

✅ Large Bolt-Down Lid – Quick and easy access for media inspection, top-up, or replacement

✅ Manual Water Drain – Convenient drainage for winterisation and maintenance procedures

✅ 1.5″ Inlet/Outlet Connections – Standard sizing for compatibility with common pool plumbing systems

✅ Pressure Tested – Each unit tested to 4 bar over 20,000 cycles for proven reliability

✅ CE Certified – Manufactured to European safety and quality standards

🔧 Technical Specifications

Specification	Value
Filter Type	Sand Filter
Model Number	EHS520V
Pool Capacity	Up to 80,000 litres (8-hour turnover)
Flow Rate	10 m³/hr
Filtration Area	0.21 m²
Filtration Rating	20-40 microns (with sand media)
Tank Diameter	520 mm (20″)
Overall Height	835 mm
Height to Valve Centre	432 mm
Sand Capacity	75 kg
Gravel Capacity	25 kg
Total Media Capacity	100 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 with glass fibre reinforcement
Valve Type	6-way multiport (side mount)
Weight (Empty)	18 kg
Colour	Yellow
Filtration Velocity	50 m³/h/m²
Certifications	CE
Warranty	12 months (contact Parts4Tubs for full terms)

📏 Pool Sizing Guide

Sizing Principle:

The filter flow rate should turn over the entire pool volume within 6-8 hours for effective filtration. More frequent turnover results in cleaner water.

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 – multiple turnovers daily
🏊 Medium above-ground	20,000-40,000 L	Excellent – ideal match
🏊 Large above-ground	40,000-60,000 L	Good – efficient 6-hour turnover
🏠 Small in-ground	Up to 50,000 L	Good – comfortable capacity
🏠 Medium in-ground	50,000-80,000 L	Suitable – 8-hour turnover
🏠 Large in-ground	80,000+ L	Consider larger filter model

This Filter:

📍 Flow Rate: 10 m³/hr 📍 Suitable for pools up to: 80,000 litres (8-hour turnover) or 60,000 litres (6-hour turnover)

💡 Tip: For pools with heavy bather loads or significant debris, consider sizing up for faster water turnover and improved clarity.

🛠️ Installation Requirements

Plumbing Connections:

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 recommended
Clearance above	Minimum 500 mm for valve operation and lid access
Clearance around	Minimum 300 mm for maintenance access
Location	Sheltered position away from direct debris

Pump Compatibility:

⚠️ The filter must be matched with an appropriately sized pump.

• Recommended pump flow rate: 8-10 m³/hr
• Pump must not exceed filter’s maximum flow rate of 10 m³/hr
• Ensure pump head pressure does not exceed 2.5 bar working pressure

💡 Important: Always install the pump before the filter in the circulation system. The filter should be positioned at the same level or above the pump for optimal priming.

🔄 Maintenance Guide

Routine Maintenance:

Task	When	How
Check pressure gauge	Weekly	Normal operating range: 0.5-1.6 bar
Backwash filter	When pressure rises 0.5 bar above clean baseline	Run until sight glass shows clear water
Rinse after backwash	After each backwash	Run for 30-60 seconds
Inspect O-rings and seals	Monthly	Replace if worn, cracked, or flattened
Check media level	Annually	Top up if settled more than 50mm
Full media replacement	Every 5-7 years	Replace sand and gravel completely

Pressure Gauge Guide:

📊 Clean filter baseline: 0.5-0.8 bar (typical) 📊 Backwash needed: When pressure rises 0.5 bar above your baseline 📊 Maximum safe operating: 2.5 bar

⚠️ If pressure exceeds 2.5 bar, stop the pump immediately and investigate the cause.

Winterisation (UK Climate):

Proper winterisation is essential to prevent frost damage:

1. Switch off pump and isolate electrical supply
2. Set multiport valve to “Waste” position
3. Remove drain plug and drain filter tank completely
4. Open air bleed valve to release any trapped water
5. Store drain plug safely to prevent loss
6. Cover filter or relocate to frost-free storage if possible
7. Never leave water in the filter during freezing conditions

⚠️ Frost damage is not covered under warranty – always winterise before temperatures drop below freezing.

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🪨 Filter Media Information

Compatible Media Types:

Media Type	Filtration Rating	Lifespan	Benefits
Silica Sand	20-40 microns	5-7 years	Economical, proven performance
Glass Media	5-15 microns	10+ years	Finer filtration, longer lasting
ZeoSand	3-5 microns	5 years	Superior clarity, ammonia absorption
OC-1 Media	Settlement filtration	10+ years	Eco-efficient, reduced backwashing

Media Capacity for EHS520V:

• Sand: 75 kg
• Gravel (support layer): 25 kg
• Total: 100 kg

Recommended Sand Grade: 16/30 grade silica sand (0.4-0.8 mm particle size)

Signs Media Needs Replacing:

• Persistently cloudy water despite correct chemical balance
• Short filter cycles between backwashes
• Sand or media particles returning to pool
• Channelling visible in media bed
• Filter more than 7 years old with original media

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🔬 Filtration Performance

Metric	Value
Filtration Rating	20-40 microns (sand) / 5-15 microns (glass)
Filtration Area	0.21 m²
Filtration Velocity	50 m³/h/m²
Flow Rate	10 m³/hr

Micron Rating Guide:

Rating	What It Removes
40+ microns	Leaves, large debris, visible particles
20-40 microns	Sand, dirt, fine visible particles, large algae
10-20 microns	Very fine particles, pollen, most algae
5-10 microns	Microscopic particles, virtually all algae

💡 Upgrade Tip: Switching from standard sand to glass media can improve filtration from 20-40 microns down to 5-15 microns, resulting in noticeably clearer water.

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⚙️ Valve Positions & Functions

The 6-way multiport valve provides complete control over water flow:

Position	Function	When to Use
Filter	Normal filtration – water passes through media	Daily operation
Backwash	Reverse flow to flush debris from media	When pressure rises 0.5 bar above baseline
Rinse	Settle media and flush to waste	After every backwash (30-60 seconds)
Waste	Bypass filter, discharge to drain	Vacuuming debris directly out, lowering water level
Recirculate	Bypass filter, return to pool	Circulating chemicals, when filter is serviced
Closed	Stop all water flow	Pump 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
🏠 Residential above-ground	Up to 60,000 L	✅ Excellent – ideal match
🏠 Residential in-ground	Up to 80,000 L	✅ Good – efficient filtration
🏊 Holiday home/rental pool	Up to 50,000 L	✅ Excellent – easy maintenance
🏡 Garden swim spa	Up to 15,000 L	✅ Excellent – ample capacity
🏢 Small commercial	Any size	❌ Not suitable – see commercial range

Best Suited For:

• Domestic above-ground pools
• Small to medium in-ground residential pools
• Pool owners seeking reliable, low-maintenance filtration
• Installations where space around equipment is limited
• Replacement for existing side-mount filter systems

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❓ Frequently Asked Questions

Q: What size pool will this filter handle? A: The EHS520V is suitable for pools up to 80,000 litres with an 8-hour turnover, or up to 60,000 litres with a faster 6-hour turnover. For pools with heavy use, sizing down on the pool volume ensures better water clarity.

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

Q: What filter media should I use? A: The filter is designed for silica sand (75 kg) over a gravel support layer (25 kg). You can also use glass media or ZeoSand for improved filtration performance. OC-1 media is compatible but check manufacturer guidance.

Q: How long does filter media last? A: Silica sand typically lasts 5-7 years before efficiency declines. Glass media can last 10+ years. Performance depends on maintenance frequency and water chemistry.

Q: What pump do I need? A: Match with a pump delivering 8-10 m³/hr. The pump flow rate should not exceed the filter’s 10 m³/hr maximum. Certikin Aquaspeed or SwimFlo pumps in 0.5-0.75 HP are typically suitable.

Q: What warranty is included? A: Certikin provides a 12-month warranty. Contact Parts4Tubs for full terms and conditions.

Q: Can I use this filter with a heat pump? A: Yes, provided the flow rate (10 m³/hr) meets or exceeds the heat pump’s minimum flow requirement. Check your heat pump specifications before purchase.

Q: How do I winterise the filter? A: Drain the tank completely, remove the drain plug, open the air bleed, and store in a frost-free location if possible. Never leave water in the filter during freezing conditions.

Q: Is this filter suitable for hot tubs? A: While primarily designed for pools, the 50°C maximum temperature rating allows use with some hot tub applications. However, a cartridge filter is generally more suitable for hot tubs due to higher filtration requirements.

Q: What are the plumbing connections? A: The filter uses 1.5″ (38 mm) connections for both inlet and outlet, compatible with standard domestic pool plumbing.

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📥 Downloads & Resources

📄 Hydroswim Filter Brochure – Technical specifications and dimensions

For additional documentation, installation guides, and spare parts information, please contact Parts4Tubs or visit the Certikin website.

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🏆 Why Choose the Certikin Hydroswim EHS520V

✅ Proven Filtration Performance – Established sand filter technology trusted by pool owners worldwide

✅ Durable Construction – Laminated polyester with glass fibre reinforcement built to last

✅ Pressure Tested Reliability – Every unit tested to 4 bar over 20,000 cycles

✅ Complete Control – 6-way multiport valve for all filtration operations

✅ Compact Side Mount Design – Easy valve access in space-restricted installations

✅ Simple Maintenance – Large lid for easy media access, integrated pressure gauge for monitoring

✅ Versatile Media Compatibility – Use with sand, glass, or alternative filter media

✅ Trusted Brand – Certikin is the UK’s leading pool equipment manufacturer with over 50 years’ experience

✅ Excellent Value – Quality filtration at a competitive price point

🤝 Why Buy from Parts4Tubs

✅ UK-Based Company – Local support from knowledgeable pool specialists

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

✅ Expert Advice – Technical guidance on sizing, installation, and compatibility

✅ Competitive Pricing – Great value on genuine Certikin products

✅ Full Warranty Support – We’re here to help with any warranty queries

✅ Easy Returns – Hassle-free returns within 30 days

✅ One-Stop Shop – Filter media, spare parts, and accessories all available

✨ Summary

The Certikin Hydroswim EHS520V delivers reliable sand filtration for domestic pools up to 80,000 litres. With its robust laminated polyester construction, 10 m³/hr flow rate, and comprehensive 6-way multiport valve, this 20-inch side mount filter provides everything needed for crystal clear pool water. Easy maintenance, proven durability, and compatibility with various filter media make the EHS520V an excellent choice for pool owners seeking dependable performance at outstanding value. Order today from Parts4Tubs for fast UK delivery.