# Internal Aquarium Filter Hagen FLUVAL U3 — 600 L/h Flow Rate

**URL:** https://aio.lv/en/product--hagen-001747--12069360
**Data updated:** 2026-04-14 14:20 (EEST)
**Category:** Aquarium Supplies
**Manufacturer:** Hagen
**Manufacturer code:** 001747
**EAN:** 015561104753
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 51.99 €
**Prices and availability valid until:** 2026-07-23 23:59
**Price without VAT (21%):** 42.97 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--hagen-001747--12069360

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 14.07.2026 | free |
| Pickup points | 17.07.2026 | 1.89 EUR |
| Courier delivery to door | 17.07.2026 | 4.99 EUR |

## Summary description

Hagen FLUVAL U3 is an internal aquarium filter with a specified flow rate of 600 L/h. Designed for mechanical and biological filtration inside the tank, it fits medium and small aquaria and provides continuous water circulation. Features include compact in-tank installation, multi-stage filter media compartments, and adjustable flow to maintain water clarity and support aquatic life.

## Long description

The Hagen FLUVAL U3 internal aquarium filter delivers mechanical and biological filtration with a rated flow of 600 L/h. Engineered for in-tank installation, this compact unit is intended for small to medium aquaria and provides continuous water circulation to help maintain clarity and a stable environment for fish and plants. The design includes multi-stage media chambers and an adjustable output to tailor flow according to tank size and stocking levels.
Advantages
The FLUVAL U3 combines mechanical trapping of debris with biological support for beneficial bacteria in separate media compartments, enabling efficient removal of suspended particles while promoting nitrification. Its adjustable flow control lets you reduce surface agitation or increase circulation as needed, and the compact in-tank layout minimizes space outside the aquarium. Installation and routine media access are designed to be straightforward for maintenance.
Suitable for
Small and medium freshwater aquaria requiring internal filtration
Tanks with moderate stocking levels where steady water flow and biological filtration are needed
Planted aquariums where adjustable flow helps protect delicate plants
Environments where compact, in-tank equipment is preferred to preserve cabinet or stand space
When it may not be suitable
This internal filter may not be appropriate for heavily stocked or large aquaria that require substantially higher turnover rates or more powerful external filtration. In tanks with very large bioloads or where powerful surface skimming is necessary, a canister filter or a higher-capacity unit would be more effective.
Key specifications
Flow rate: approximately 600 litres per hour
Filter type: internal, in-tank installation
Filtration stages: multi-compartment media design for mechanical and biological filtration
Flow control: adjustable output to vary circulation intensity
Recommended aquarium size: small to medium tanks
How to use
Mount the FLUVAL U3 inside the aquarium using the provided suction-fit or bracket system at a depth and position that ensures even water circulation. Fill the media compartments with the appropriate filter media as instructed, prime the unit if required, and connect to power following safety guidelines for electrical equipment near water. Use the flow adjustment feature to set a circulation rate suitable for the inhabitants and decor; reduce flow for fragile plants or fry, and increase flow for better surface agitation and oxygen exchange. Perform regular maintenance by rinsing or replacing media according to water test results and manufacturer's maintenance intervals.
What to consider before purchase
Confirm your aquarium volume and compare required turnover rate to the filter's 600 L/h flow capacity
Assess stocking level and bioload to determine if internal filtration is sufficient
Plan for routine media maintenance access inside the tank
Ensure compatible mounting location and clearance within the aquarium
Usage recommendations
For stable water quality, aim for a turnover of 4–6 times the aquarium volume per hour where appropriate; use the adjustable flow to balance circulation with the needs of fish and plants. Monitor ammonia, nitrite and nitrate levels after installation and during the first weeks to ensure biological filtration is established. Schedule gentle media rinses in tank water to preserve beneficial bacteria and replace mechanical media when clogged to maintain the effective 600 L/h flow.

## FAQ

### How much does the Hagen FLUVAL U3 Internal Aquarium Filter 600 L/h cost, and is it available for purchase?

The price is 51.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 11 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 14.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Hagen products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Hagen service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/12069360/67554310_large.webp