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💧 Clear water, clear edge — don’t let your tank fall behind!
Seachem PhosGuard is a premium aquarium water treatment that rapidly removes phosphate and silicate from marine and freshwater tanks. Its highly porous, bead-shaped media optimizes water flow and filtration capacity, outperforming competing products. Perfect for aquarists seeking crystal-clear water and healthier aquatic environments.


| ASIN | B00029PO6O |
| Allergen Information | Yam Free |
| Best Sellers Rank | #9,601 in Pet Supplies ( See Top 100 in Pet Supplies ) #62 in Aquarium Water Treatments |
| Brand | Seachem |
| Brand Name | Seachem |
| Customer Reviews | 4.6 out of 5 stars 2,016 Reviews |
| Global Trade Identification Number | 00000116018500 |
| Included Components | Seachem PhosGuard, 100 mL bagged - 67101850 |
| Item Form | Liquid |
| Item Type Name | Seachem PhosGuard, 100 mL bagged - 67101850 |
| Item Weight | 0.07 kg |
| Liquid Volume | 100 ml |
| Manufacturer | Seachem Laboratories, Inc. |
| Manufacturer Part Number | 185 |
| Model Number | 185 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Pet Type | Fish |
| Target Species | Fish |
| UPC | 000116018500 |
| Unit Count | 1 Count |
| Warranty Description | Warranty |
T**O
Effective and Reliable Phosphate Remover for Aquariums
I’m absolutely thrilled with Seachem PhosGuard and here’s why I’m giving it a 5-star review: 1. Excellent at Removing Phosphates: I’ve been dealing with high phosphate levels in my aquarium for a while, and Seachem PhosGuard has been a game-changer. After using it for just a few days, I noticed a significant reduction in algae growth, which was one of my main concerns. The product works efficiently at removing phosphates, improving water clarity, and maintaining the overall health of my tank. 2. Easy to Use: The 100 mL bag is convenient and easy to place in the filter. It’s designed to be used in a filter bag, which makes it super simple to add to your system. I also appreciate that it’s not messy and doesn’t leave any residue in the tank once it’s in place. 3. Safe for Aquatic Life: I love that Seachem PhosGuard is safe for my fish and plants. I’ve had no negative effects on the aquatic life in my tank after using it, which is a huge relief. It’s one of the reasons I trust Seachem products—they’ve always proven to be gentle on sensitive ecosystems. 4. Fast-Acting Results: The results were quick! My water cleared up in just a few days after starting to use it. You can see the improvement in the clarity of the water and a reduction in algae build-up. If you have any phosphate-related issues in your tank, this product will definitely help. 5. Long-Lasting: While the bag is small, it goes a long way! The 100 mL lasts quite a while, and you can reuse it for multiple cycles. This makes it a cost-effective solution for keeping phosphate levels in check. 6. Great for Freshwater and Saltwater Tanks: I’ve used this in both my freshwater and saltwater aquariums with great success. Whether you’re managing a fish-only tank or a reef tank, this product works across the board. 7. Reliable Brand: Seachem is a brand I’ve trusted for years, and this product lived up to the high standards I’ve come to expect from them. Their products are always effective and reliable, and PhosGuard is no exception. Final Thoughts: If you’re battling high phosphate levels in your aquarium, Seachem PhosGuard is a must-have. It’s effective, easy to use, and safe for both fish and plants. The results are noticeable quickly, and I’ll definitely be keeping this product stocked in my aquarium maintenance supplies! 🌟 Highly recommend for anyone needing to reduce phosphates and improve water quality in their tank!
N**R
Removes silicates very well!!
I have had two packs in the sump for my 125 gallon aquarium for about 4 days and can finally see the pink on the rocks without having to clean them. The diatoms are finally meeting their doom!
C**Y
Yes
Works.
A**Y
Quickly solved my phosphate problem!
I have a 7 1/2 gallon aquarium that was constantly having a 10.0 phosphate level on API's phosphate test kit. I'd read that Chemipure Blue and Chemipure Elite can remove phosphates, so I tried both of those. Unfortunately, those didn't work, as the phosphate level stayed at or near 10.0 for the most part. Then, I tried doing more frequent water changes, but that didn't help either. I came across this product and gave it a try. After 2 days, there was no change, but on the 7th day after adding this product, the phosphate level had been lowered to 0.0! I'd been having major problems with algae (due to the phosphates, no doubt), but since using this, I've gotten very minimal algae growth in the tank. Good product --- I wish I'd found it sooner.
J**.
Great filter media but make sure it has good water flow over it
This product works as described, and I recommend it to others. I was having a phosphates problem for a while in my salt water tank at work because some of my macro algae had broken down in a spot I couldn't reach and was decaying there. I also, unbeknownst to me for a while, had an reverse osmosis/de-ionization filter system that wasn't pulling all the phosphates out of my top-off water. Bottom line, I was able to get the problem in better control using PhosGuard. That's good because the excess phosphates were really feeding some hair algae that had sprung up in my tank. The one thing that you have to note about this product is that it really needs to be in a place where it gets good water circulation over the media. I haven't had much luck in applications where there isn't much flow going directly over the PhosGuard. Additionally, depending on the prices at the time of purchase, you may be able to save money by buying a bag for the PhosGuard and buying the larger quantities of PhosGuard. Once when I did the math, it was about the same price to just keep buying these 100 mL bags, but the next time I needed some it was cheaper to buy the bag and the larger bottle of PhosGuard. Apparently the price of these fluctuate a bit. Other than that, I recommend this to others trying to keep phosphates under control.
B**E
Good Easy to Use Phosphate Remover
A quality product that I’ve used in the past. I like the small ready to use bags for a “quick” absorption of phosphates. Doesn’t solve the underlying cause so don’t think that. You’ll still have to figure out the why. Also be careful not to use too long or too much so as not to strip all nutrients. Has proven effective for me without compromising my fish or corals with proper use.
G**O
Excelente
Muy bueno
B**K
Phosguard and Algae control
PhosGuard I am sure is a good product but it is not a cure for algae unless you have a problem with phosphates or silicates which I think most will not. I have several planted tanks. Plants and algae do not go well together so based off reviews I gave this a try. I tried Phosguard and traded one problem for another. What I have found out is most algae thrive on deficiencies control one cause another to pop up. One thing common to most all algae is nitrites, nitrates and ammonia I have started using Purigen and stopped with the Phosguard the plants are much healthier and I have ALL forms of algae under control. I think Seachem make some great products but it is still up to the user to determine what it is that you need. Seems everyone is an expert but 90% of what people tell you is wrong. So try to focus on reliable sources and do all things in moderation. Your tank and your fish will thank you for it. It is not a cure for Algae but under very specific conditions which are not the norm but more of an exception.
Z**L
Top
Top produkt,👍 Ich bin sehr zufrieden.
J**N
Cumple con lo esperado
Encantado con el producto cumple perfectamente su cometido!
A**N
Best Seachem Products
Original Seachem product. My water had a lot of phosphates and had diatom nightmare and this product reduced a very little bit. The best thing I recommend installing a UV filter will kill floating diatom to some extent and control it by doing more water changes. The seller is a good and genuine Seachem product
J**A
Buen producto
Excelente producto. Realmente baja los fosfatos en acuario marino
K**L
Works well
Works well prefer already bagged
Trustpilot
1 week ago
3 weeks ago