- Purigen is a premium synthetic adsorbent that is unlike any other filtration product. It is not a mixture of ion exchangers or adsorbents, but a unique macro-porous synthetic polymer that removes soluble and insoluble impurities from water at a rate and capacity that exceeds all other competing products by over 500%. Purigen controls ammonia, nitrites and nitrates by removing nitrogenous organic waste that would otherwise release these harmful compounds. Purigen’s impact on trace elements is minimal. It significantly raises redox. It polishes water to unparalleled clarity. Purigen darkens progressively as it exhausts, and is easily renewed by treating with bleach. Purigen is designed for both marine and freshwater use.
- Capacity: Purigen’s possesses enhanced capacity owing to its vast surface area. All other resins on the market are purely spherical extruded beads. These beads remain smooth even under a microscope. Purigen® is both spherical and macroreticular. It has microscopic pores that increase its usable surface area to many times that of a purely spherical resin.
- Regeneration: Purigen can also be regenerated. As it adsorbs waste products, Purigen will change color from a pale blonde to a dark brown, almost black. Once it is exhausted, it can be regenerated with a solution of bleach and water. The bleach will literally “burn off” the organics that have been removed from the tank. Watch out for products that claim to be regenerable with a brine solution. That is the regeneration procedure for ion-exchange purposes. A brine solution will not remove organics. While such resins have a limited capacity for organic adsorption, a brine regeneration process only replaces removed ionic compounds. It does not destroy large organic molecules that were removed, which is the primary function of organic adsorption resins.
View the full Seachem range. 
Product Code: 36795316
Selectivity: Purigen is the highest capacity organic filtration resin on the market. No other products can compare to its ability to clear haziness and polish water to unparalleled clarity. Unlike other products on the market which are simple ion-exchange resins, Purigen is specifically designed to be an organic scavenging resin. When ion-exchange resins are filled to capacity by metals and other contaminants, Purigen has barely begun to reach its potential. Purigen generally ignores simple elemental compounds, having an extreme affinity for nitrogenous organics. The primary source of nitrogenous compounds in an aquarium is waste. Fish, corals, even plants produce nitrogenous waste. Purigen removes that waste faster and more completely than anything else on the market.
Rinse before use. Use in a fine mesh (180 micron or less) filter bag such as Seachem’s The Bag. Each 250 mL treats up to 1,000 L (250 US gallons) for up to six months. Exhaustion is indicated by a pronounced discoloration of the beads to dark brown or black.
REGENERATION: Soak in a 1:1 bleach:water solution for 24 hours in a non-metallic container in a well ventilated area and away from children. Use regular 8.25% hypochlorite household bleach (non-scented, no dyes, do not use a splash-less bleach). Rinse well, then soak for 8 hours with a solution containing 4 tablespoons of Prime, or equivalent dechlorinator per cup of water. Rinse well. Caution: some slime coat products may permanently foul Purigen® and render regeneration difficult. Do not reuse if odor of bleach/chlorine is detectable. In case of doubt, soak beads in small quantity of water and test for residual chlorine with a chlorine test kit.
Standard Delivery (for online orders only)
FREE for online orders £49.99 and over
£4.99 for online orders £49.98 and under
£5.50 or £10.00 additional charge for orders being delivered to North Scotland, Scottish Highlands & Island delivery zones, please see the below section for more details.
Orders containing one or more items labelled as "Local Delivery" do not qualify for our Standard Delivery and are charged at a different rate (see below, these orders do not qualify for free delivery if over £49.99).
Standard delivery is normally delivered in up to 3 working days, Monday - Friday (Excluding Bank Holidays & Public Holidays) for online orders received before 1pm. Orders received after 1pm may still be processed that day and delivered within 3 working days but in most instances will not be processed until the next working day and then delivered within 3 working days from then. This time frame is a guide and unfortunately not always achievable.
Northern Scotland, Highlands & Isles Delivery Zones
Standard Delivery
Isle of Wight
The following postcodes will incur a £5.50 delivery surcharge:
PO30-PO41
Industrial Scotland, Scottish Grampians, Highlands & Isle of Skye
The following postcodes will incur a £10.00 delivery surcharge:
AB35-AB38
AB54-AB56
FK18-FK21
IV1-IV63
KW1-KW14
PA21-PA38
PA80
PH17-PH26
PH30-PH41
PH49-PH50
Heavy Goods Delivery
Isle of Wight & Industrial Scotland
The following postcodes will incur a £7.50 delivery surcharge:
DD1-DD11
DG1-DG14
DG16
EH1-EH55
EH91
EH95
EH99
FK1-FK21
KA1-KA26
KA29
KA30
G1-G84
G90
KY1-KY16
KY99
ML1-ML12
PA1-PA19
PA21-PA36
PA37
PA80
PH1-PH16
TD1-TD15
Scottish Grampians
The following postcodes will incur a £9.00 delivery surcharge:
AB10-AB16
AB21-AB99
North Scotland & Highlands
The following postcodes will incur a £22.00 delivery surcharge:
IV1-IV28
IV30-IV36
IV40
IV52-IV54
IV63
KW1-KW3
KW5-KW14
PA33
PA38
PH17-PH26
PH30-PH41
PH49
PH50
Any additional surcharges will be displayed for approval at checkout. In rare circumstances we may be unable to fulfil some orders based on the delivery location and/or the size & weight of the item, if this is the case we will notify you as soon as possible and refund your order.
We reserve the right to amend these selected postcodes at our discretion.
In store purchases
Products purchased in store are not eligible for our standard online delivery services and are not free if £49.99 or over. Availability of, and prices for delivery of in-store purchases will vary depending on the items purchased and store purchased from. Delivery for items purchased in-store is also limited to the local area of the store the item is purchased from and these items are not eligible for delivery to Northern Scotland, Highlands & Isles delivery zones.
A member of staff in store will be able to advise on the availability, price and timescale of delivery for items purchased in-store.
14 days to change your mind
Within the first 14 days of your item being delivered you may decide to return it to us for any reason. If you do we will refund the cost of the item and your initial delivery charge.
Some items are excluded from this policy, and any item returned must be in a resalable condition.
Faulty items
If you discover your product to be faulty within the first 30 days of purchase, please contact us and we will be able to arrange the return of your parcel, for a full refund of your purchase cost, including initial postage price. If you send the product back to us, we will also cover the cost of your return postage to the value of £10.
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