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Help articles
Setup guides, filter help, and answers to the questions we hear most.
Browse help articlesFrequently asked questions
How is the Nexxus System installed?
The Nexxus mounts vertically on your main incoming water line (point of entry), with 10 to 12" of clearance below the housings for filter service. It uses 1" NPT inlet and outlet connections, and an upstream shut-off plus a bypass valve are strongly recommended. Operate within 110 PSI and 40 to 125°F. Professional installation by a licensed plumber is recommended.
What is the Delta Plan?
The Delta Plan is our $55 per month membership, about $1.83 a day. Filters are included on the plan and ship free the moment they are due, and the plan also covers real-time monitoring, live water alerts, a monthly water quality report, and standard accessories including batteries, O-rings and the housing wrench. It is one plan per Nexxus System, with a 3-month minimum, then it continues month to month and you can cancel anytime. You can add the Delta Plan in your cart, or on the Delta Plan page.
Which NSF standards is the Nexxus System built to?
The Nexxus System is built with components certified to NSF/ANSI 42 for taste and odor, and NSF/ANSI 372 for low-lead materials. Our official NSF listing is public and was re-recorded on 26 August 2026.
What does it filter?
The Nexxus uses three sequential stages: Stage 1 Sediment Guard, Stage 2 your targeted filter (Lead Barrier Pro, VOC Guard Max, or Heavy Metals Defense), and Stage 3 PFOS Ultra. Together they are engineered to reduce the contaminants that matter most in your area, such as chlorine, sediment, VOCs, heavy metals, and PFAS/PFOS.
Has the Lead Barrier Pro filter been independently tested by NSF?
Yes. The Nexxus Lead Barrier Pro Filter was independently tested by NSF to 7,200 gallons at 5.6 gpm for lead reduction per NSF/ANSI 53, and tested for Class IV particulate reduction per NSF/ANSI 42. Those results are recorded on our official NSF listing, re-recorded on 26 August 2026. This result is specific to the Lead Barrier Pro filter and does not extend to the other filters in the range.
What does the Nexxus App show me?
The Nexxus Core reports to the Oasis Water Technologies app in real time. You see live readings from your system, capacity tracking for each of the three stages so you know where every filter stands, and instant alerts when something changes. Delta Plan members also receive a monthly water quality report.
How do I replace my filters?
The three stages must stay in order: Stage 1 Sediment Guard (dark navy), Stage 2 your targeted filter, and Stage 3 PFOS Ultra (orange). Replace the Nexxus Core batteries at each filter change. Delta Plan members receive replacement batteries at no additional cost.
How do I know which filter pack I need?
Enter your ZIP on The Grid by Oasis Water Technologies to see what public water data reports for your area, contaminant by contaminant. That result points you to the Stage 2 filter built for what your water actually shows: Lead Barrier Pro, VOC Guard Max, or Heavy Metals Defense. On the Delta Plan, we match and ship the right pack for you, so there is no guessing.
How often do filters need to be replaced?
Filter life is not a fixed date. It depends on your household water use and how much your incoming water loads each stage. Rather than guess, the Nexxus Core tracks capacity and flags each stage in the app as it nears the end of its life, and the Delta Plan can ship replacements ahead of that moment.
How do I connect my Nexxus to Wi-Fi and set up the Nexxus Core?
The Nexxus Core pairs during first-time setup in the Oasis Water Technologies app: power the Core, sign in, and follow the on-screen steps to join it to your home Wi-Fi. Keep it on a 2.4 GHz network within range of your router. Filtration works from the moment the system is installed whether or not the Core is online; the Wi-Fi connection is what unlocks live readings, capacity tracking, and alerts.
Why isn't my Nexxus showing live data?
The Nexxus Core runs on batteries and communicates over Wi-Fi. Filtration keeps working even if the batteries die, but monitoring and alerts stop until they are replaced. Check the batteries and your Wi-Fi signal, then refresh in the app. A dead battery or lost connection is not by itself a system defect.
What is your warranty and return policy?
Every Nexxus System comes with a 5-year Manufacturing Quality Guarantee from the original date of purchase. It covers verified manufacturing defects in system components, however the system is installed. Coverage for performance, leaks and installation-related issues requires installation by a licensed professional plumber.
Do you ship across the USA?
Yes. The Nexxus System is designed and assembled in the USA and ships nationwide. Delta Plan members get free shipping on filter packs.
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