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: 354455962

🔒secure drawstring seal

🧵180 micron ultra-fine mesh

♻️durable & reusable nylon

4745 kr

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Description

🐠 Elevate your aquarium’s clarity with precision you can trust!

BUILT TO LAST REUSE - Heavy-duty stitching and premium nylon mesh withstand repeated washes without wear.
OPTIMIZED FOR FINE MEDIA - Specifically designed for very fine resins and activated carbon, maximizing filter efficiency.
SAFE CHEMICAL RESISTANT - Odorless, rust-free, and resistant to bleach and acids—100% fish-safe filtration.
SECURE DRAWSTRING CLOSURE - Custom drawstring ensures no media leakage, protecting pumps and aquatic life alike.
ULTRA FINE PRECISION FILTRATION - 180 micron mesh traps even the tiniest resin particles for crystal-clear water.

The ALEGI Media Filter Bag is a 7.5" x 3.6" ultra-fine 180 micron nylon mesh bag designed for very fine filter media and activated carbon. Featuring a secure drawstring closure and durable, chemical-resistant construction, it prevents resin escape and protects both pumps and fish. Reusable and built to last, this 3-pack is a must-have for professional-grade aquarium filtration.

Specifications

ASIN	B083Q4R7KB
Best Sellers Rank	#48,078 in Pet Supplies ( See Top 100 in Pet Supplies ) #485 in Filter Accessories
Item Weight	18 g
Manufacturer	ALEGI
Net Quantity	3.0 Count
Package Dimensions	17.27 x 9.65 x 1.02 cm; 18 g

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4745 kr

Duties & taxes included

In stock

Sold byAmazon IcelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Iceland.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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