Does it fit the trigger sustem sumps filter sock holder? The holes are oval

I have a ruby 36 by trigger and the cups were a little loose. So my husband cut the rings off a couple of old filter socks and put the rings around the top of the filter cup and it fits nice and snug now.

And what is the best filter media to put inside?

"Best" is 100% subjective based on the inhabitants of the tank and what you're doing. I use ChemiPure Elite or Blue (1 bag in as I've found two clogs it up).

Will this replace 2.75 filter socks on waterbox aio???

No - this is a 4" media cup designed to replace 4" filter socks. I have it on my 100.3 waterbox. I am not sure if RedSea makes a 2.75" media cup.

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Red Sea Reefer Filter Media Cup - 4" Durable Aquarium Filter Sock Replacement - Easy Maintenance for Saltwater & Reef Tanks

Product ID: 71503769

Details

Brand
Red Sea
Capacity
1 liters
Included Components
PHL306207
Installation Type
Countertop or
Item Weight
0.19 kg
Model Name
Red Sea 4 inch

🔄Universal Red Sea Reefer fit

🧪1L media capacity

🧼Easy-clean design

575 kr

Duties & taxes included

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Sold byAmazon DenmarkDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🐠 Elevate your reef’s clarity with effortless filtration!

OPTIMIZED CAPACITY - Holds up to 1 liter of filter media to maximize water clarity and tank health
DURABLE REEF READY - Built tough for saltwater and reef tanks, ensuring long-lasting performance
SEAMLESS INTEGRATION - Fits all Red Sea Reefer sump holders and compatible with REEFER and MAX systems
EFFORTLESS MAINTENANCE - Drop-in design for quick media swaps and hassle-free cleaning
VERSATILE MEDIA COMPATIBILITY - Supports filter pads, floss, biological media, carbon, and GFO for tailored filtration

The Reefer Filter Media Cup is a durable 4-inch replacement filter sock designed for Red Sea Reefer and MAX aquarium systems. It holds up to 1 liter of various filter media, enabling customizable filtration for saltwater and reef tanks. Its drop-in design ensures easy maintenance and compatibility with all Red Sea Reefer sump holders.

Specifications

ASIN	B07FK62JM9
ASIN	B07FK62JM9
Best Sellers Rank	#87,722 in Pet Supplies ( See Top 100 in Pet Supplies ) #696 in Aquarium Water Treatments #1,255 in Aquarium Filter Accessories
Brand Name	Red Sea
Capacity	1 liters
Container Type	Bottle
Customer Reviews	4.5 4.5 out of 5 stars (365)
Date First Available	July 12, 2018
Global Trade Identification Number	00730773421770
Included Components	PHL306207
Installation Type	Countertop or Drop-in
Item Dimensions L x W x H	8"L x 4"W x 8"H
Item Type Name	filter cup
Item Weight	0.19 kg
Item model number	730773421770
Manufacturer	Red Sea
Manufacturer	Red Sea
Model Name	Red Sea 4 inch Filter Media Cup
Model Number	730773421770
Number of Items	1
Number of Packs	1
Other Special Features of the Product	Reverse Osmosis
Part Number	4346788623
Product Dimensions	8 x 4 x 8 inches; 6.74 ounces
Purification Method	Activated Carbon, Reverse Osmosis
Supported Water TDS Level Maximum (PPM)	350
UPC	730773421770
Unit Count	1 Count

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