Consider using the Aqua-Pure C-CS-FF which is the same spec filter but cheaper:

Aqua-Pure 3M C-CS-FF F-701 Compatible

2 x Replacement InSinkErator F-701 to Suit all Models including GN1100 HC1100 and any Insinkerator system that uses a water filter system.

This filter is also a suitable replacement for the F601 and F601-R water filter.

Purchase the Insinkerator F701 in a Twin Pack and save!

The InSinkErator® F701 Filtration system reduces chlorine taste and odour, as well as sediment, resulting in sparkling water perfect for drinking or cooking, right at your sink. It also reduces levels of lead and water hardness. Ensure the quality of your water with the InSinkErator Filtration System.

Clearer and Healthier Water

Enjoy crystal clear water that is free of chlorine taste and odour, sediment, and other impurities for a clean, refreshing taste. Filtered water reduces temporary water hardness and lime scale buildup in the system tank to prolong tank life, ensuring years of efficient operation.

Improves Taste and Aroma of Beverages

Bring out the rich full-bodied aroma of your coffee and enhance the natural flavor of your tea. You’ll find that beverages made with InSinkErator filtered water taste superior to those prepared with ordinary tap water.

Removes Impurities and Temporary Harness

Replaceable cartridges reduce chlorine and other impurities such as lead, pesticides and herbicides that affect the taste of your tap water.

It also reduces the calcium, magnesium, and lime scale that creates unsightly scum on tea and coffee and buildup in the hot water heating tank. It uses a proprietary Blend of Weak Acid-Cat Ion Exchange Resin (WAC) and Strong Acid-Cat Ion Exchange Resin for maximum performance and longer tank life.

Quick-change Cartridge with Automatic Water Shut-Off

Filters twist on and off quickly and easily. During filter replacement, water flow stops automatically for no drips and no clean up.

The F701 filter should be replaced every 6 months for safer drinking water and worry-free operation.

Replaces the following TRU013 and TRU014