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.

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🐠 Keep your aquarium crystal clear with the ultimate fine mesh filter bags!

SECURE DRAWSTRING CLOSURE - Locks in resins tightly to protect pumps and keep fish safe.
ULTRA FINE 180 MICRON MESH - Captures the tiniest filter media particles for pristine water clarity.
PERFECT FIT FOR 100 ML MEDIA - Optimized size for maximum efficiency with fine filter resins.
HEAVY DUTY NYLON CONSTRUCTION - Built to last through countless cleanings without wear or odor.
CHEMICAL RESISTANT FISH SAFE - No metal parts, no rust, no harmful smells—just pure filtration power.

The ALEGI Media Filter Bag is a 7.5" x 3.6" reusable, ultra-fine 180 micron nylon mesh bag designed to securely hold very fine filter media and activated carbon. Its heavy-duty stitching and drawstring closure prevent media leakage and protect aquarium pumps and fish. Resistant to chemicals and odor-free, it’s built for durability and safe, efficient filtration.

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