# Filter bio ball MARINA Aqua Natura, replacement cartridge, Ø 42 mm, PP

**URL:** https://aio.lv/en/product--marina-tn-45166--12254387
**Data updated:** 2026-04-14 22:27 (EEST)
**Category:** Aquarium Supplies
**Manufacturer:** MARINA
**Manufacturer code:** TN-45166
**EAN:** 5904479451668
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 2.99 €
**Prices and availability valid until:** 2026-08-10 23:59
**Price without VAT (21%):** 2.47 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--marina-tn-45166--12254387

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 30.07.2026 | free |
| Pickup points | 04.08.2026 | 1.89 EUR |
| Courier delivery to door | 04.08.2026 | 4.99 EUR |

## Summary description

MARINA Aqua Natura bio ball is a filter replacement cartridge made of polypropylene (PP) with a diameter of 42 mm. Designed for biological filtration in aquarium systems, the porous ball provides surface area for beneficial bacteria, improving water quality and supporting nitrogen cycle processes. Suitable for small filters and routine cartridge replacement.

## Long description

MARINA Aqua Natura bio ball is a replacement filter cartridge made from polypropylene with a diameter of 42 mm. The porous spherical shape offers increased surface area for colonisation by nitrifying bacteria, supporting biological filtration in freshwater aquarium systems. This cartridge is intended for routine replacement in compatible small filters to maintain stable water parameters and reduce organic load.
Advantages
The polypropylene construction is resistant to degradation in aquarium water and provides a consistent porous structure that encourages beneficial bacterial growth. Its compact 42 mm diameter makes it suitable for small filter housings while allowing efficient water flow around the media. As a dedicated biological media, it helps stabilise ammonia and nitrite levels when used as part of a complete filtration routine.
Suitable for (tasks / use cases)
Biological filtration in small to medium freshwater aquariums
Replacement cartridge for compatible external or internal filter units
Supporting nitrification and reducing toxic nitrogen compounds
Routine maintenance and periodic media replacement
When it may not be suitable
This bio ball is designed specifically for biological filtration and does not provide mechanical or chemical filtration on its own; it should be used alongside mechanical sponges or chemical media when particulate removal or toxin adsorption is required. It may not fit larger filter systems or housings that require a different cartridge size or shape.
Key specifications
Material: polypropylene (PP)
Shape: porous spherical bio ball
Diameter: 42 mm
Intended function: biological filter media for aquarium use
How to use
Place the bio ball inside the filter chamber or designated cartridge slot where biological media are recommended. Ensure water flow passes over and through the porous surface to maximise bacterial colonisation. Replace the cartridge according to the aquarium’s maintenance schedule or when water quality measurements indicate reduced biological activity. Rinse only with aquarium water if temporary cleaning is necessary to avoid removing beneficial bacteria.
What to consider before purchase
Confirm the 42 mm diameter and spherical shape fit your filter housing or cartridge holder
Understand that this item provides biological filtration only and may need to be paired with mechanical or chemical media
Check compatibility with freshwater systems and the specific filter model before ordering
Usage recommendations
Introduce the bio ball into the filter as part of a layered media approach: mechanical filtration first to remove solids, followed by biological media like this bio ball. Allow a stabilization period after installation for beneficial bacteria to establish before relying on it for full nitrification; monitor ammonia and nitrite levels during this period.

## FAQ

### How much does the MARINA Aqua Natura bio ball Ø 42 mm cost, and is it available for purchase?

The price is 2.99 € (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 30.07.2026 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 MARINA 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 MARINA 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