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))

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: 181547272

🔒secure drawstring seal

🧵180 micron ultra-fine mesh

♻️durable & reusable nylon

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€ 15.49

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Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🐠 Elevate your aquarium game with precision filtration that lasts!

SECURE DRAWSTRING CLOSURE - Locks in filter media, protecting pumps and fish alike
ULTRA FINE 180 MICRON MESH - Captures the tiniest debris for crystal-clear water
PERFECT FIT FOR 100 ML MEDIA - Optimized size (7.5" x 3.6") for maximum filtration efficiency
HEAVY DUTY NYLON CONSTRUCTION - Built to last through countless cleanings without wear
CHEMICAL RESISTANT ODOR FREE - Safe for aquatic life, unaffected by bleach or acids

The ALEGI Media Filter Bag is a premium 180 micron nylon mesh filter bag designed for extra-fine aquarium media. Measuring 7.5" by 3.6", it securely holds up to 100ml of fine filter resins with a durable drawstring seal that prevents media loss and protects pumps. Its heavy-duty, chemical-resistant construction ensures long-lasting reuse without odor or rust, making it a trusted choice for maintaining pristine aquatic environments.

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