RESEARCH

Studies and proposals.

Open engineering work on giving every home access to safe drinking water, using technology that already exists. Shared freely so builders, plumbers and manufacturers can use it.

By Raymundo Razon Abad, civil engineer (licensed in the Philippines) and independent researcher. ORCID

A 90-second overview of all five studies.

Questions or comments? Join the discussion on YouTube or on our Facebook page.

Engineers, builders and policymakers: the building-scale side of this work is at rai-purewater.com, including

Open hydro-infrastructure reference design Published

A reference design for building-level reverse osmosis feeding a dedicated purified drinking-water line, with business models built on it. It explains the system's physics and leaves design options open, so manufacturers and engineers can build their own versions.

Video overview of the discussion draft (September 2026, not peer reviewed).

Questions or comments? Join the discussion on YouTube or on our Facebook page.

From crack to catalyst: the dedicated drinking-water line as an Industry 5.0 platform Published

Why a building-code requirement for a separate drinking-water pipe could turn the home into a standard connection that water, beverage and appliance companies design to, and what that could save households. Working paper, November 2026.

Video overview of this working paper.

Questions or comments? Join the discussion on YouTube or on our Facebook page.

Closed-loop water for new development Published

A cost review of Pure Water Southern California using public numbers, and a development-scale alternative for new housing: drinking-water line, roof cisterns, graywater and recycled water. Discussion draft, October 2026.

Safe Drinking Water at the Tap Act (model bill) Published

A concept draft of state legislation that would require new homes to include a home drinking-water system, supplied by licensed providers who test for PFAS and publish yearly water-quality reports. Not legal advice and not introduced legislation.

Open cistern RO design for Philippine homes Published

A zero-waste reverse osmosis system for homes that store water in a cistern: the rejected water goes back to the cistern instead of down the drain. Built from standard hardware-store parts. Technical note, November 2026.

PFAS mitigation reference design Draft

How a building reverse osmosis system on a dedicated drinking line separates PFAS from drinking water, and why handling the rejected water matters. Early draft: no pilot PFAS measurements yet.

Short-chain PFAS in drinking water In preparation

A plain-language document on short-chain PFAS ("forever chemicals"), what common home filters do and don't remove, and how reverse osmosis handles them.

Short explainer: what PFAS claims on filter boxes do and don't cover.

Questions or comments? Join the discussion on YouTube or on our Facebook page.

Proposed California Title 24 amendment In preparation

A proposed change to the California Plumbing Code and CALGreen that would require new homes to include a dedicated drinking-water line, so every new home has a simple, built-in path to safe drinking water.

Short explainer on why a drinking-water line is cheapest to add while the walls are open.

Questions or comments? Join the discussion on YouTube or on our Facebook page.

Join the discussion.

Questions, corrections and ideas are welcome in the comments on our YouTube channel and our Facebook page. We read and answer them there.

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