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.

Alegi Aquarium Extra Fine Media Filter Bag 7 5 3

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Description

🕶️ Elevate your aquarium game with ultra-fine filtration finesse!

DURABLE REUSABLE DESIGN - Heavy-duty nylon mesh with reinforced stitching withstands repeated washing without losing integrity.
SAFE CHEMICAL RESISTANT - Odorless, rust-free, and resistant to bleach and acids, guaranteeing a toxin-free aquatic environment.
SECURE DRAWSTRING CLOSURE - Prevents media leakage and protects pumps and fish from accidental ingestion.
ULTRA FINE 180 MICRON MESH - Captures the tiniest particles, ensuring crystal-clear aquarium water and healthier fish.
PRECISION FIT MAXIMUM EFFICIENCY - Sized at 7.5" x 3.6" to perfectly hold 100ml of fine filter media for optimal filtration.

The ALEGI Aquarium Extra Fine Media Filter Bag (7.5" x 3.6", 3-pack) features a 180 micron nylon mesh designed for fine filter media and activated carbon. Its secure drawstring seal prevents media leakage and protects aquatic life, while durable construction ensures long-term reuse. Safe, chemical-resistant, and odor-free, these bags deliver superior filtration performance for pristine aquarium water.

Specifications

ASIN	B083Q4R7KB
ASIN	B083Q4R7KB
Best Sellers Rank	#9,523 in Pet Supplies ( See Top 100 in Pet Supplies ) #62 in Aquarium Filter Accessories
Brand Name	ALEGI
Customer Reviews	4.6 4.6 out of 5 stars (1,554)
Date First Available	January 9, 2020
Date First Available	January 9, 2020
Item Package Dimensions L x W x H	6.8 x 3.8 x 0.4 inches
Item Weight	0.634 ounces
Manufacturer	ALEGI
Manufacturer	ALEGI
Number of Items	3
Package Dimensions	6.8 x 3.8 x 0.4 inches; 0.63 ounces
Size	7.5"*3.6" (3 pack)

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