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5 Micron Carbon Block Replacement Filter for Marine Depot and SpectraPure


Item #: RO1133

In Stock

5 micron carbon block prefilter
  • nominal 5-micron rating
  • high dirt-holding capacity maximizes utilization of the carbon block
  • high porosity design helps prevent the cartridge from plugging before its adsorption capacity is exhausted, maximizing the utilization of the carbon while maintaining low pressure drop.
  • manufactured entirely from FDA-compliant materials
Please note that these replacement cartridges are interchangeable with Marine Depot`s, Kent Marine`s, and SpectraPure`s RO or RO/DI units. We have researched the best replacement cartridges among these three manufacturers and offer only the best of each below.

**Variations of this product can be found in many online stores. The version we carry is of the highest quality. Although this item is eligible for price matching under our Low Price Guarantee, please be certain the product you want to price match is the same make and model.

Manufacturer information

Marine Depot was started in 1998 by a self-professed reef geek and pre-med student Ken Wong. Ken envisioned a one-stop shop where customers could find everything they needed, from technical product specifications, reef aquarium information, expert advice on the hobby and friendly one-on-one customer support. Having grown from a one-man crew to being one of the world’s largest suppliers of reef and marine aquarium products, this very core philosophy still lives strong in the Marine Depot culture 20 years later.

5 Stars


Reviewed on
March 26, 2019

Yes, I would recommend this.

Fits and works great

This is a great filter for the price and it fits my water filter system.

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luke roebuck

Reviewed on
October 30, 2012

Yes, I would recommend this.

Carbon Block Filtraton

I have heavy metal issues from new home copper piping and use the carbon Block (two in series) to remove chlorine as well as heavy metals from my tap water inlet to my sump. The Carbon Block filters last about 3 months and removes all the chlorine and most heavy metals while leaving most of the hardness. I run a drip system style water changer to about 200 tanks. I further remove more copper in the sump but the carbon blocks are the first chemical removal media and works great!

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mike bossman

Reviewed on
January 19, 2009

Yes, I would recommend this.

Generic Carbon

This 5.0-micron carbon block appears to be a generic product with minimal information on tha packaging. I bought this for a drinking water pre-filter, but think that I'd rather pay the extra $3 and get the RO1131 0.5-micron filtering carbon block (which is what I'll do in the future) which has clear labeling as a high quality carbon block product. However if this is used as a filter element in an aquariun where turbidity is a problem, this 5.0-micron carbon filter would not clog as quickly with particulate matter as should last much longer - which would be a big advantage in that application. However I don't like the lack of information on the lableing on this product which is why I wouldn't recommend it.

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Reviewed on
September 20, 2008

Yes, I would recommend this.

Great item

Not only the product is great but the service is beyond my expectations. Thanks!

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evan papadopoulos

Reviewed on
February 15, 2008

Yes, I would recommend this.

Micron Carbon Block

Have no complaints with this product; having clean water is crucial in our hobby.

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james castanetta

Reviewed on
June 08, 2007

Yes, I would recommend this.

did what i hoped...

I use it on a DIY auto top off unit I made for an outdoor pond, as long as I change the filters on a timely basis no chlorine or chloramines register from the unit I have set up and plus it does not clog as quickly as some of the other filters, which is exactly what i hoped for...

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