Poolex HDPE-450 Opti side-mount sand filter 7.8 m³
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The Poolex HDPE-450 Opti Side Mount sand filter 7.8 m³/h is a durable and powerful sand filter for the efficient filtration of medium-sized swimming pools. With a maximum flow rate of 7.8 m³/h and a filter tank with a diameter of 450 mm, this filter offers an excellent combination of capacity, reliability, and ease of use.
The filter tank is manufactured from strong and recyclable HDPE (High Density Polyethylene). This material is excellently suited for long-term use in pool installations. The side-mounted 6-way valve (Side Mount) makes operation and maintenance simple while keeping the top of the filter tank clear.
According to Poolex, the HDPE-450 has a maximum capacity of 7.8 m³/h, a filter surface area of 0.16 m², and is designed for pools up to approximately 45 m³, assuming a filtration cycle of about 6 hours.
Side Mount 6-way valve
In this version, the 6-way valve is located on the side of the filter tank. This offers a practical setup for technical rooms and makes the top of the tank more accessible.
The main functions of the pool filtration can be set via the 6-way valve:
- Filter – normal filtration of the pool water
- Backwash – backwashing and cleaning the filter medium
- Rinse – rinsing after a backwash
- Waste – discharging water directly to the drain
- Recirculate – circulating water without filtration
- Closed – shutting off the water flow
In addition, the filter features a pressure gauge, which allows for easy monitoring of the pressure in the filter system.
Strong HDPE filter tank
The filter tank is made of recyclable high-density polyethylene (HDPE). The OPTI series has been developed with an emphasis on reliability, durability, and easy maintenance.
The tank has a diameter of 450 mm and a height of approximately 730 mm. Due to its compact dimensions, the filter can also be used in technical rooms where available space is limited.
For the HDPE-450, Poolex specifies a pool volume of up to approximately 45 m³ at a theoretical filtration time of about six hours.
For the best performance, it is important to match the capacity of the pool pump with the sand filter. Also, take into account pipe length, height differences, and other components that cause resistance.
Suitable for both filter sand and filter glass
The Poolex HDPE-450 can be filled with traditional filter sand or with suitable filter glass.
For this model, Poolex specifies the following quantities:
Filter sand: approximately 45 kg
Filter glass: approximately 35 kg
Filter medium is not included as standard.
50 mm connections
The HDPE-450 is equipped with 1½″ / 50 mm connections. This makes the filter particularly suitable for pool installations with 50 mm PVC pipes, and it can be combined with various compatible pool pumps.
Why choose the Poolex HDPE-450 Opti Side Mount?
The Poolex HDPE-450 Opti Side Mount sand filter 7.8 m³/h is an excellent choice for those looking for a solid filter tank for a permanent or high-quality pool installation. The combination of a Ø450 mm HDPE tank, 7.8 m³/h capacity, 50 mm connections, 6-way valve, and pressure gauge makes this model both practical and durable.
With space for 45 kg of filter sand or approximately 35 kg of filter glass and a pool capacity of up to approximately 45,000 liters, this Poolex sand filter provides a reliable basis for clear and clean pool water.
Specifications
Specifications
Benefits
Benefits
Disadvantages
Disadvantages
Information and manual
Information and manual
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Read more in our frequently asked questions
What is the delivery time if I order today?
What is the delivery time if I order today?
The delivery time varies per item and is always clearly stated on the product page.
Once your order has been placed, it will be processed and shipped as quickly as possible. Orders that are in stock in our warehouse are often dispatched on the same business day.
Good to know:
- You can find the exact delivery time with each item
- You will receive a track & trace code as soon as your order has been shipped
- Delivery may take a little longer during busy periods
What are the shipping costs?
What are the shipping costs?
Within the Netherlands and Belgium, you pay €8.95 in shipping costs for orders under €75.
For orders of €75 or more, you benefit from free shipping.
For delivery to other countries, shipping costs are calculated automatically during checkout, depending on the destination and the size of the order.
What if my order arrives damaged?
What if my order arrives damaged?
In that case, please contact us immediately. We will ensure the problem is resolved quickly, for example by exchanging the item or sending a replacement part.
We strive to provide a suitable solution within 24 hours, so that you can quickly get back to enjoying your purchase.
Can I order an item that is out of stock?
Can I order an item that is out of stock?
Yes, that is possible. We can order the item from the supplier for you.
In that case, the delivery time is approximately one week on average.

