Postage is £3.95 1st class delivery or free with a fish delivery
What is Purigen ?.
Let's get the science bit out of the way ,"A premium synthetic absorbent that is unlike any other filtration product ,It is not a mixture of ion exchange or absorbents ,but a unique macro porous
synthetic polymer"
What this means is that Purigen is a fantastic product that because of its special qualities should be stocked by every aquatic store.
Produced in America in Seachem laboratories ,after years of research ,it is now one of their major selling products worldwide .

Purigen is an extra fine filtration media which is placed in a fine mesh bag and placed within the filter ,as the water passes through ,it then gets to work absorbing nitrogenous organic waste that is present in the aquarium.By removing this waste it then controls ammonia, nitrate and nitrite ,preventing them causing major problems .

Another main reason for using Purigen is it's amazing value for money.If used in a 100cm aquarium it will last for months.As it gradually turns a dark brown, which indicates that it is full of waste ,magically it is not finished.Take it out of the tank and soak it in bleach,then treat in a mixture of water and Prime 
( another fantastic Seachem product ) and it is completely rejuvenated.

So if you have a Marine, Freshwater or Planted aquarium, you will need crystal clear water in which to show off your creation to it's optimum best,there is only one product that can really achieve this.
That product is Purigen .

Directions

Always rinse before use. We find Purigen in best used in a fine mesh (180 micron or less) filter bag such as Seachem’s The Bag™ -product code 020250 on our site . 

Each 250 mL treats up to 1,000 L (250 US gallons) for up to six months. Exhaustion is shown by a discoloration of the beads to dark brown or black.