2 x Marina i25 Replacement Fish Tank Filter Cartridge

£4.99 RRP £5.59 Save £0.60


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In StockFree Delivery
24 Hour dispatch if you order before 12.30pm

The Marina i25 Replacement Power Cartridge is made specifically to fit inside the Marina i25 internal filter.  The 3 in 1 system of mechanical, chemical and biological filtration has a unique design that allows the water in your tank to enter through the centre of the cartridge.

The filter is split into two different chambers; the water enters the first chamber (the zeolite chamber) that removes toxic ammonia. It then enters the activated carbon chamber to remove all pollutants and odours. Finally the water enters the floss layer which traps any debris inside the cartridge. This unique flow of water results in crystal clear water. For best results replace every four weeks.

  • Ideal for Goldfish and Tropical tanks.
  • 3 in 1 filtration system
  • Keeps your fish tank water crystal clear

Code: 606484

Customer Reviews 4.5 5 4.5/5 Based on 4 reviews


good service Reviewed by Anonymous on 19 Sep 2010

Speedy delivery, kept well informed of order progress. Will definitely be using again.


At last we can see out again! Reviewed by Goldie & Chocolate on 03 Sep 2010

After several unsuccessful (but obvious) attempts to tell our owner that we were really not happy with the quality of our water, she at last decided to get a lovely new Marina i25 filter. The problem was she couldn't get hold of replacement cartridges. Back to terrible water conditions. Until - she found The Pet Express Website. The cartridges were much cheaper than anywhere else and the delivery price was less than the bus fare into town. Within a few days of ordering online we had our new cartridges. Yippee! Thanks to Pet Express we are happy bunnies - sorry goldfish - again.


Top Service Reviewed by Christiana on 11 Aug 2010

I would just like to thank The Pet Express for their super speedy service. I have been trying to order replacement cartridge filters for the Marina i25 for several weeks now. Even the local Pet Store has orders from their two main suppliers for me but to no avail. So thanks once again for your excellent service. The Marina i25 cartridge filters the waters through three chambers to provide a cleaner biological environment for your fish. The Marina i25 itself is not really a powerful device but adequate for up to 22 litres of water.


A very good filter Reviewed by Sebastian Gilbert on 09 Aug 2010

Price: **** Ease of use: ***** Reliability: **** Shortly after purhcasing this product online, i recived a very curteous email advising me that they were out of stock, and would i like to cancel my order, wait or order an alternative. I chose to wait, and shortly afterwards the items were re-stocked and sent to me, which i was very pleased with. The filters themselves are fine, i had little choice as they were refils for the filter system that is incorperated into my tank. They work very well, easy to fit etc. However you can get at least 2x the shelf life out of them, instead of throwing them away when dirty, just wash them with warm water, alow to cool back to room temperature, and re-use. -------------------------------------------- 1x Shubunkin (Nelson) 1x Weather Loach (Tyrone) 1x Goldfish (Bryant) 1x Fan-Tail Goldfish (Tarquin) Marina Cool 25 Fish Tank Marina i25 filters

Free delivery on orders over £45

Spend over £45 and we'll deliver your order using a Next Day delivery service for free!*

All delivery charges will be automatically shown at the checkout. We're very sorry but this offer does not apply to UK Highlands and Islands postcodes.

Orders under £45

Order Weight Delivery Service Delivery Price
Under 2kg UK Mail Next Day £3.99

2kg - 6kg

UK Mail Next Day £4.49
6kg - 30kg UK Mail Next Day £5.99
30kg+ UK Mail Next Day £0.32p per kg

*For orders over £45 where the total order weight is greater than 30kg, the delivery for the first 30kg will be free and then just 32p per kg thereafter.

How quickly will my order arrive?

Our aim is to dispatch all items within the allocated dispatch times (Same day/24 hour/48 hour dispatch). Please note if your order contains multiple items, the order dispatch time will be from the item with the longest dispatch time to ensure you receive your whole order in a single delivery. All of our products state how long the dispatch time will be for that product before you add to the cart. All orders are sent using a next working day delivery service. You should receive your item from 1 - 2 working days after dispatch. Bulky items may incur an extra 24hr delay.

We will send you a notification email when your order has been dispatched.

While we always try our best to dispatch every order following the above guidelines, during extremely busy periods dispatch times may increase by up to one day. We will keep you updated on the status of your order via email.

Delivery notifications

We will email you when your order is dispatched by us and our courier will email you on the day of delivery with a 1-hour delivery slot.

If you provide a mobile number when you checkout, our courier will also send an SMS message on the day of delivery with a 1-hour delivery slot.

Order Tracking

You will receive an email to confirm we have received your order and that your payment has been accepted. You will also receive an email when your order has been dispatched.

In your dispatch confirmation email we will include any relevant tracking numbers, allowing you to track your parcel on the UK Mail website

If you provide a mobile number when you checkout, our courier will send an SMS message on the day of delivery with a 1-hour delivery slot.

Manage your delivery

We have teamed up with UK Mail to provide our customers with the best delivery service possible which is both fast and flexible.

If we miss you on the first delivery attempt, we will try again the next working day. Alternatively, you can visit UKmail.com and easily re-arrange your delivery to something which suits you better! You can choose from the following options:

  • Collect from depot
  • Leave in a safe place
  • Leave with a neighbour
  • Request a different delivery day

Free delivery for local postcodes

If you live within five miles of any of our Plymouth, Paignton, Torquay or Exeter shops listed you can get FREE delivery on orders over £20. The delivery cost will automatically be removed as soon as you enter your shipping address during the checkout. Click here to see full addresses.

Please click here to find out more about delivery and returns.


Here at The Pet Express we want you to enjoy every time you shop with us. Occasionally we know you may want to return items, we have tried to make our terms as clear as possible to avoid any nasty surprises.

  • Products can be returned up to 14 days from date of delivery for a full refund or exchange.
  • Any free gifts must be returned with your order or we withhold the right to deduct the RRP value of the free gift from your refund.
  • We are unable to accept part used returns of food, engraved ID tags, damaged products (unless delivered damaged) or veterinary medicines.
  • You are responsible for the cost of returning the product back to us, unless they arrive damaged, faulty or the incorrect item is delivered.
  • The product must be in its original packaging, unopened and in a re-saleable condition and the cost of collection or return will remain at your charge. 
  • We only accept returns for products that have been purchased through us.
  • Medicines: We regret that we cannot, by law, accept returns of any medication including all flea treatments and wormers. If you return a medicine to us all we can do is dispose of it for you as it cannot be resold.

Please see our full returns policy for more information.