D&D H2Ocean

D&D H2Ocean - ROWAPhos 500g - Anti phosphate freshwater and seawater

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D&D H2Ocean - ROWAPhos 500ml - Anti phosphate freshwater and seawater
D&D H2Ocean - ROWAPhos 500ml - Anti phosphate freshwater and seawater

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The Rowa brand guarantees that Rowa Phos removes more phosphate than any other commercially available anti-phosphate on the market today.

Learn more


Phosphate adsorption capacity: 25g per kilogram of RowaPhos.


Using advice. :

To obtain the best phosphate and silicate reduction results with RowaPhos resin and to keep levels close to zero in your aquarium, you should follow the product's recommendations and use the resin regularly, for example renewing it every 1 to 2 months.

Phosphates are a known source of cyanophyte invasion in the aquarium, red for saltwater or green for the freshwater aquarium. Source of nutrients for these harmful algae, few freshwater aquarists think of eradicating this plague with an anti-phosphate resin.

The practice is much more widespread for marine aquariums.

RowaPhos absorb phosphates, silicates and arsenic. It is completely safe in freshwater and saltwater aquariums. When exhausted, it does not release any chemicals into the water.

Rowa Phos has been tested over 5-year longevities without change, no release has been measured.

Method :

Never wash the product. It must be kept moist at all times, it is not effective if it dries out. After use close the lid or recondition in another container.

Place the product between two layers of perlon and use in forced passage if possible. Otherwise use a sock and place it in a place with strong passage of aquarium water.

Do not pour into the aquarium without a container.

Do not place it in water without surrounding it with filter wool such as perlon.

You can use a fluidized filter but keep a layer of perlon at the end of it to avoid the dispersion of colored dust. The active base of the product being certainly iron oxide (supposition of Atlantid-France and binding only on us)

Regularly measure the phosphate level to monitor the effectiveness of the resin. When these rise, you must renew your anti-phosphate resin.

Note: Unfortunately, most phosphate test kits available are not capable of detecting minute levels of phosphate.
It is necessary in a reef aquarium for example not to exceed a rate of 0.015ppm.
for the aquarium, slightly higher rates can be tolerated.

Product Details

ROwaphos500

What they think about it
(and they are right...)

Reviews about this product
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9.8/10


Based on 9 reviews

  • Image utilisateur Jean A.
    Published Sep 28, 2025 at 07:03 pm (Order date: Sep 17, 2025)
    5

    - (Translated review)

  • Image utilisateur Thomas w.
    Published Mar 30, 2025 at 11:56 pm (Order date: Mar 24, 2025)
    5

    In testing, I went from 0.38 to 0.10 in 3 days, but I have no doubt it will go down further. (Translated review)

  • Image utilisateur Lionel k.
    Published Apr 24, 2024 at 07:47 pm (Order date: Apr 19, 2024)
    5

    Perfect (Translated review)

  • Image utilisateur Jean Claude B.
    Published Apr 17, 2024 at 07:20 pm (Order date: Apr 11, 2024)
    5

    I'm still skeptical, despite the reassuring instructions, about the intense "color" that emerges if you don't rinse at least superficially. (Translated review)

  • Image utilisateur Frédéric B.
    Published Apr 03, 2024 at 09:13 am (Order date: Mar 27, 2024)
    5

    very effective in combating phosphate build-up in the tank (Translated review)

  • Image utilisateur Dominique S.
    Published Jul 09, 2023 at 10:19 pm (Order date: Jul 02, 2023)
    5

    Ok great product (Translated review)

  • Image utilisateur Christophe M.
    Published Mar 04, 2023 at 10:00 am (Order date: Feb 19, 2023)
    5

    Super resin (Translated review)

  • Image utilisateur Kevin d.
    Published Dec 25, 2022 at 03:34 pm (Order date: Dec 20, 2022)
    4

    At the top (Translated review)

  • Image utilisateur Johan L.
    Published Oct 18, 2022 at 04:13 pm (Order date: Oct 13, 2022)
    5

    My PO4 level has already dropped a few days after installation, so its reputation seems well-deserved. (Translated review)