# Internal Aquarium Filter sera F 400 (adjustable) – model SE-06821

**URL:** https://aio.lv/en/product--sera-se-06821--12053140
**Data updated:** 2026-03-12 19:36 (EET)
**Category:** Aquarium Supplies
**Manufacturer:** sera
**Manufacturer code:** SE-06821
**EAN:** 4001942068215
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 30.49 €
**Prices and availability valid until:** 2026-07-15 23:59
**Price without VAT (21%):** 25.20 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--sera-se-06821--12053140

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 06.07.2026 | free |
| Pickup points | 09.07.2026 | 1.99 EUR |
| Courier delivery to door | 09.07.2026 | 4.99 EUR |

## Summary description

Adjustable internal aquarium filter sera F 400 (SE-06821) designed for mechanical and biological filtration inside freshwater or marine tanks. The compact unit mounts inside the tank and offers adjustable flow to suit different aquarium sizes and livestock. Suitable for continuous filtration, water circulation and improved water clarity in home aquariums.

## Long description

The adjustable internal aquarium filter sera F 400 (model SE-06821) is a compact, submersible unit designed for mechanical and biological filtration inside freshwater and marine tanks. Intended for continuous operation, the filter provides water circulation and improved clarity by removing suspended particles and supporting beneficial bacterial colonization. Its adjustable flow control allows adaptation to different tank sizes and types of aquarium livestock while mounting directly inside the aquarium to save external space.
Advantages
The sera F 400 combines mechanical prefiltration with a biological filter chamber to reduce debris and promote nitrifying bacteria development. Its adjustable flow mechanism enables precise control of water movement to suit plants, fish, or invertebrates. The compact internal design simplifies installation and maintenance without requiring an external canister or sump. Low operational noise and energy-efficient performance make it suitable for continuous use in home aquariums.
Suitable for
Small to medium freshwater aquariums that require compact internal filtration
Marine tanks where moderate circulation and biological filtration are needed
Planted aquariums that benefit from adjustable flow to protect delicate plants
Tanks with community fish or invertebrates that prefer gentle to moderate current
Key specifications
Type: Internal, submersible aquarium filter
Filtration stages: Mechanical and biological
Flow control: Adjustable output to regulate water circulation
Mounting: Inside-tank installation with suction or bracket system
Intended use: Continuous operation for water clarification and biological filtration
How to use
Install the sera F 400 inside the aquarium at a stable position on the glass using the included mounting system, ensuring the unit is fully submerged to the recommended level. Connect to a suitable power source and adjust the flow control to the desired output for the tank inhabitants and layout. Place mechanical filter media in the prefilter section and biological media in the biological chamber as specified by the manufacturer. Regularly inspect and clean the mechanical media to prevent clogging and maintain flow, while leaving biological media mostly intact to preserve beneficial bacteria colonies.
Usage recommendations
For best results, match the filter output to aquarium volume and livestock needs: lower flow settings for delicate plants and small fish, and higher settings for tanks needing stronger circulation. Perform periodic partial media rinses in aquarium water to retain nitrifying bacteria and avoid full replacements of biological media. Monitor water clarity and adjust flow as tank conditions change.

## FAQ

### How much does the Internal Aquarium Filter sera F 400 cost, and is it available for purchase?

The price is 30.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 10 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 06.07.2026 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 sera 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 sera 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/12053140/67539222_large.webp