# Ceramic Filter Media Rings Tetra Tetratec CR series for aquarium filters (model CR 400/700/2400) - biological filtration media

**URL:** https://aio.lv/en/product--tetra-20561--12053543
**Data updated:** 2026-03-12 19:36 (EET)
**Category:** Aquarium Supplies
**Manufacturer:** Tetra
**Manufacturer code:** 20561
**EAN:** 4004218145573
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 12.49 €
**Prices and availability valid until:** 2026-07-24 23:59
**Price without VAT (21%):** 10.32 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--tetra-20561--12053543

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 13.07.2026 | free |
| Pickup points | 16.07.2026 | 1.89 EUR |
| Courier delivery to door | 16.07.2026 | 4.99 EUR |

## Summary description

Ceramic filter rings Tetra Tetratec CR series (suitable for CR 400, CR 700, CR 2400) are porous biological filtration media designed for aquarium filters. The rings provide a large surface area for beneficial bacteria colonization, improving nitrification and water clarity. Use in canister or internal filter compartments to support biological filtration and reduce ammonia and nitrite levels.

## Long description

Ceramic filter media rings Tetra Tetratec CR series (models CR 400, CR 700, CR 2400) are porous biological filtration media engineered for aquarium filters. Manufactured by Tetra, these ceramic rings offer an extensive internal surface area that promotes colonization by beneficial nitrifying bacteria. When installed in a canister or internal filter compartment, the rings support stable biological filtration, contributing to the reduction of ammonia and nitrite and helping maintain clearer water and healthier conditions for fish and invertebrates.
Advantages
The ceramic rings have a highly porous structure that increases bacterial habitat without occupying excessive space in the filter. Their durable ceramic composition resists breakdown and maintains performance over time. Because they are inert and non-toxic, the rings do not alter water chemistry, allowing biological processes to proceed without unintended side effects. The design is compatible with standard aquarium filter compartments and easy to rinse for routine maintenance.
Suitable for
Freshwater and marine aquariums requiring biological filtration support
Canister filters and larger internal filters with media compartments
Tanks with established stocking where ammonia and nitrite control is necessary
Aquariums undergoing cycling or recovery after water quality issues
Key specifications
Material: porous ceramic
Function: biological filtration media for colonization by nitrifying bacteria
Compatibility: designed for use in filter media compartments (models CR 400, CR 700, CR 2400 and similarly sized filters)
Form factor: ring-shaped elements to maximise surface area and flow-through
Chemical behavior: inert, does not leach additives into water
How to use
Rinse the ceramic rings briefly with dechlorinated or tap water to remove dust before first use. Place them in the biological media compartment of a canister or internal filter so that water flow passes through the rings, ensuring contact with the porous surfaces. Do not replace all existing biological media at once; introduce the ceramic rings gradually to preserve established bacterial colonies. During routine maintenance, rinse the rings gently using aquarium water to avoid removing beneficial bacteria.
Usage recommendations
For stable biological filtration, combine ceramic rings with mechanical and chemical media as needed: mechanical media to trap solids and chemical media for specific contaminant removal. Monitor ammonia and nitrite levels after installation and avoid aggressive cleaning that would drastically reduce bacterial populations. Replace only a portion of the rings at a time if necessary to maintain continuous nitrification.

## FAQ

### How much does the Ceramic Filter Rings Tetra Tetratec CR 400/700/2400 cost, and is it available for purchase?

The price is 12.49 € (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 13.07.2026 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 Tetra 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 Tetra 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/12053543/67539618_large.webp