Will these work for Phosguard?

They are very fine mesh to hold in the finest media particles. But water flows through them easily so I don't see a problem with them working with any media. So I'll say "Yes" they will work with Phosguard.

Would this work as a filter guard for an internal filter in a freshwater aquarium?

If the internal filter can fit into the bag, I think it's a good idea! You can search on amazon:" Alegi fine bags" for different sizes!

Are the zippers made of metal or plastic?

This is drawstring bags. It doesn't contain any metal. is completely safe for both fresh and saltwater aquariums.

I have a cascade 1500 filter from penn and plax can I put 3 purigen bags in 3 of my trays amd what size bad should I use for a 55 gallon tank?

A basic purigen bag will treat up to 100 gallons for 6 months or so with proper regeneration. I use a 250ml bottle of purigen in one of the alegi media bags and have it in a wet/dry for a 90g tank. You won't need 3 for a 55. One will do fine.

7 5 3 6 3 Pack | Desertcart Belgium

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€ 18.60

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Sold byAmazon BelgiumDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🕸️ Elevate your aquarium’s clarity with precision filtration that lasts!

DURABLE REUSABLE DESIGN - Heavy-duty nylon and stitching withstand multiple washes without wear.
LEAK PROOF DRAWSTRING SEAL - Custom drawstring closure prevents media loss and protects pumps from damage.
PRECISION FILTRATION POWER - 180 micron mesh traps the finest debris for crystal-clear water.
OPTIMIZED MEDIA COMPATIBILITY - Perfectly sized for 100ml fine filter media like Phosguard and Purigen.
FISH SAFE CHEMICAL RESISTANT - No metal parts, odorless, and resistant to bleach and acids for safe aquatic environments.

The ALEGI Aquarium Extra Fine Media Filter Bag (7.5" x 3.6", 3-pack) features a 180 micron nylon mesh designed for ultra-fine filter media like activated carbon and resins. Its durable, chemical-resistant construction and secure drawstring seal ensure safe, reusable filtration that prevents media loss and protects aquarium pumps, delivering consistently crystal-clear water for your aquatic ecosystem.

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The product quality is outstanding. Exactly what I needed for my work.

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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