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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Aquarium Extra Fine Media Filter Bag 7.5"*3.6" 3 Pack | Reusable 180 Micron Drawstring Mesh Filter Bags For Very Fine Resins Filter

Product ID: 181547272

🔒secure drawstring seal

🧵180 micron ultra-fine mesh

♻️durable & reusable nylon

€ 15.33

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Sold byAmazon PortugalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🐠 Elevate your aquarium’s clarity with precision filtration!

REUSABLE HEAVY DUTY - Wash, reuse, and reduce waste without losing strength
SAFE ODORLESS NYLON - No rust, no smell, just pure aquatic safety
SECURE DRAWSTRING CLOSURE - Locks in filter media to protect pumps and fish alike
ULTRA FINE 180 MICRON MESH - Captures the tiniest particles for crystal-clear water
PERFECT FIT FOR 100 ML MEDIA - Optimized size for maximum filtration efficiency

The ALEGI Media Filter Bag is a 7.5" x 3.6" reusable mesh bag featuring an ultra-fine 180 micron nylon mesh designed for very fine filter media and activated carbon. Its secure drawstring closure prevents media leakage and protects aquarium pumps and fish. Constructed with durable, odorless, and rust-free materials, it supports repeated washing and reuse, making it an eco-friendly and efficient filtration solution for aquarists seeking pristine water quality.

Specifications

ASIN	B083Q4R7KB
ASIN	B083Q4R7KB
Best Sellers Rank	#11,837 in Pet Supplies ( See Top 100 in Pet Supplies ) #78 in Aquarium Filter Accessories
Brand Name	ALEGI
Customer Reviews	4.6 4.6 out of 5 stars (1,538)
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
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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