Reverse Osmosis Systems

Nelsen Corporation RO Replacement Filters

Find Nelsen Corporation-compatible filters and manuals by selecting your system below

Nelsen Corporation is an established manufacturer of water filters, and drinking water systems, including the Aqua Classic and Aqua Elite RO systems. To find compatible RO filter and part replacements, select your Nelsen system below.

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Nelsen RO Models

Aqua Classic I RO System

Aqua Classic II RO System

Aqua Elite I RO System

Aqua Elite II RO System

Nelsen Filtration 50 GPD RO System

Nelsen Corporation Frequently Asked Questions

How do I replace my Nelsen RO filters?

Start by selecting your Nelsen reverse osmosis system above. You'll be taken to a page that provides manuals or instructions for your specific Nelsen RO model. General filter replacement instructions are available here.

How do I order replacement filters for my Nelsen RO drinking water filtration system?

Start by clicking on the photo of your Nelsen RO system above. From there, you can add the needed filters to your cart. The RO membrane requires replacement every 2 years, whereas the sediment and carbon filters need to be changed every 6-12 months, depending on the volume of water usage and the source water quality.

Which Nelsen membrane or filters do I need for my RO filter system?

Select your Nelsen RO unit from the list above. You will be taken to a new page that shows the available membrane and filters for your RO system. Be sure to select the correct membrane size (listed in GPD or gallons per day). If you have any questions, please call our customer support team at 877-377-9876. We're available Monday through Friday, 9 am to 5 pm Central Time.

What contaminants will Nelsen RO systems remove?

Nelsen reverse osmosis filters and membrane can remove common pollutants from water including pesticides, sulfates, fluoride, nitrates, lead, pharmaceuticals, arsenic and more. The RO system's carbon filter will also remove chloramines and chlorine.

Learn more about what contaminants can be removed with reverse osmosis filtration.

Which Nelsen Corporation RO systems do you offer compatible replacement filters for?

ESP Water sells filters, membranes, and parts compatible with the Nelsen Aqua Classic I, Aqua Classic II, Aqua Elite I, Aqua Elite II, and Nelsen Filtration 50 GPD RO System. View all supported models on the Nelsen Corporation RO Replacement Filters page.

How often should I replace filters in my Nelsen RO system?

Replace sediment and carbon filters every 6–12 months, and the RO membrane every 2–3 years, depending on water quality and usage. Compatible parts are available for the Aqua Classic I and Nelsen Filtration 50 GPD systems.

How do I know which replacement filters match my Nelsen RO model?

Identify your model (Aqua Classic, Aqua Elite, or Nelsen Filtration series), then select its corresponding filter set from ESP’s model-specific pages, such as Aqua Elite I or Aqua Classic II. This ensures correct sizing and membrane compatibility.

What signs indicate that my Nelsen RO filters need to be replaced?

If you notice slow water flow, unpleasant taste or odor, cloudy water, or rising TDS levels, it’s time to replace your filters. Slow flow is common with clogged filters—learn more in the Why RO Water Flow Is Slow article, then choose replacements from your model’s page.

Can I install Nelsen RO filter replacements myself?

Yes. Nelsen RO filter changes are DIY-friendly. Turn off water, relieve pressure, and swap cartridges as directed in your system manual. For general help, use ESP’s RO Filter Replacement Instructions. Compatible parts are available for all supported models, including Aqua Elite II.

Are Nelsen replacement filters interchangeable with other RO brands?

Some Nelsen systems use standard 10″ filter sizes, but membrane specs and stages vary by model. Always match filters to your exact system using ESP’s model pages, such as the Aqua Elite I or Aqua Classic I RO systems.

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