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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🐠 Filter Fine, Live Fine – Because Your Aquarium Deserves the Best

BUILT TO LAST WASH REUSE - Heavy-duty stitching ensures long-term durability and eco-friendly reuse.
SAFE FOR YOUR AQUATIC FRIENDS - Non-toxic, rust-free nylon mesh keeps fish safe and water pristine.
LOCK IT DOWN PROTECT YOUR PUMP - Custom drawstring seal prevents media leakage and pump damage.
PRECISION FILTRATION ZERO ESCAPE - 180 micron mesh traps even the finest resins for crystal-clear water.
FITS PERFECTLY FILTERS EFFICIENTLY - Sized 7.5" x 3.6" to hold up to 100ml of fine filter media with ease.

ALEGI's Extra Fine 180 Micron Mesh Filter Bags (3-pack) offer ultra-precise filtration for very fine resins and activated carbon. Designed with a secure drawstring seal and durable nylon construction, these reusable bags prevent media leakage and pump damage while ensuring a safe, rust-free environment for your fish. Sized at 7.5" by 3.6", they hold up to 100ml of filter media, making them an essential upgrade for any serious aquarium enthusiast.