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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ALEGI Media Filter Bag Aquarium Extra Fine,Reusable 180 Micron Drawstring Mesh Filter Bags for Very Fine Resins Filter (7.5"*3.6" (3 Pack))

Product ID: 263412740

🔒secure drawstring seal

🧵180 micron ultra-fine mesh

♻️durable & reusable nylon

Description

♻️ Keep it clean, keep it clear — filtration that works as hard as you do!

BUILT TO LAST REUSE - Heavy-duty stitching and premium nylon mesh withstand repeated washes without losing integrity.
OPTIMIZED FOR FINE MEDIA - Perfectly sized for 100ml fine filter media like activated carbon and Purigen, enhancing filtration efficiency.
SECURE DRAWSTRING CLOSURE - Custom drawstring design ensures no media escapes, protecting pumps and fish alike.
CHEMICAL RESISTANT FISH SAFE - No metal parts, odorless, and resistant to bleach and acids for a safe aquatic environment.
ULTRA FINE PRECISION FILTRATION - 180 micron mesh traps even the tiniest resin particles, keeping your aquarium crystal clear.

The ALEGI Media Filter Bag is a 7.5" x 3.6" reusable, ultra-fine 180 micron nylon mesh bag designed for very fine aquarium filter media. Its secure drawstring closure prevents media leakage, protecting pumps and fish. Durable and chemical-resistant, it’s built for repeated use and optimized for 100ml fine media like activated carbon and Purigen, ensuring superior filtration and longer pump life.

Specifications

ASIN	B083Q4R7KB
Batteries Included	No
Best Sellers Rank	#21,171 in Pet Supplies ( See Top 100 in Pet Supplies ) #1,087 in Aquarium Accessories
Customer Reviews	4.6 4.6 out of 5 stars (1,406)
Date First Available	4 February 2020
Item Weight	18 g
Package Dimensions	17.27 x 9.65 x 1.02 cm; 18 g
Quantity	1
Size	7.5"*3.6" (3 pack)
batteries required	No

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