NSA Water Filter Replacement Guide: Which Model Do You Need?

NSA water filters were popular for years, but the NSA models have been discontinued. If you still have an NSA unit under your sink, on your counter or on your ice maker line, you need a replacement that fits how your system is set up. Here is a quick guide to matching your old NSA filter with the right made-in-USA replacement from USA Filtration.

NSA 100S and 100SX under sink filters: USA-100

The USA-100 Under Sink Water Filter replaces the NSA 100S and 100SX. It is a 5-stage filtration and purification system with bacteriostatic GAC/KDF media and a 25,000-gallon capacity. It hooks up to your existing water line and faucet with quick connect or compression fittings, and measures 14 inches tall by 5 inches in diameter.

NSA 50C countertop filter: USA-50

The USA-50 Countertop Water Filter replaces the NSA 50C. It installs in minutes without tools, fits all faucets (adapters included) and uses 5-stage GAC/KDF filtration. If you need a new faucet diverter, the USA-50 diverter valve is sold separately.

NSA 25I appliance and ice maker filter: USA-25

The USA-25 Appliance Water Filter replaces the NSA 25I. It installs inline on the water line to your ice maker or refrigerator with quick connect fittings, and compression fittings are also available.

Not sure which one you have?

Look for the model number on your filter housing, or note where the unit is installed: under the sink, on the counter or on an appliance line. You can also contact us or call 888-672-3458 and we will help you find the right replacement. Browse all of our NSA replacement filters.

*NSA is a trademark of its respective owner. USA Filtration is not affiliated with NSA.