Results

Bench results · ECT2 / Onterris

Independent laboratory testing of CAST pretreatment ahead of ion exchange for PFAS. Bench-scale data — site performance is confirmed in a paid on-site pilot.

ECT2 PFAS bench test Download summaries

ECT2 (now Onterris) · RSSCT · May 2025

CAST pretreatment extended ion-exchange bed life

Rapid small-scale column testing (RSSCT) by ECT2 (now Onterris) comparing Dow PSR2+ ion exchange with and without Flotration CAST pretreatment. Treatment target: USEPA MCLs (e.g. 4 ng/L PFOA / PFOS). Design basis: 20 GPM.

PFOS to 4 ng/L

With CAST

~13,767 bed volumes

~60 days at 20 GPM

Without CAST

<1,619 bed volumes

~7 days at 20 GPM

PFOA to 4 ng/L

With CAST

~13,276 bed volumes

Delayed breakthrough

Without CAST

~5,487 bed volumes

Earlier breakthrough

Column pressure

With CAST

Slow build

Continuous operation

Without CAST

Pressure spikes

Daytime-only monitoring

Media OpEx example

With CAST

~$13,000 / year

At governing capacity

Without CAST

~$18,700 / year

More frequent changeouts

Bench-scale RSSCT results. Bed volumes and day estimates at 20 GPM are illustrative of the test design basis. Full-scale performance is site-specific and confirmed in pilot. OpEx figures are media-replacement examples from the executive summary and exclude disposal, labor, and installation.

Source PDFs (one click): ECT2 executive summary · Technical white paper

now Onterris

Independent lab test

ECT2 PFAS bench test

Flotration contracted ECT2 (now Onterris) to run RSSCT on client-representative test water with and without CAST pretreatment ahead of Dow PSR2+ resin. CAST is not described in the lab report (proprietary); the comparison isolates the pretreatment effect on PFAS breakthrough and column pressure.

PFOS: ~13,767 BV to 4 ng/L with CAST vs under 1,619 BV without — about 60 days vs 7 days at 20 GPM.
Pressure: CAST influent built pressure slowly and ran continuously; without CAST, spikes required close daytime monitoring.
Lab: ECT2 (now Onterris) · report date May 15, 2025 · design basis 20 GPM.

View executive summary View technical white paper Download summary Download white paper

CAST bench-test kit in a protective case with tubing — used for client influent testing — **Bench-test kit.** Portable CAST module used to treat client influent before RSSCT — the same class of hardware used in the ECT2 evaluation path.

3D-printed model of three CAST modules side by side — illustrative form factor only, not a functional unit — **Modular form factor (model).** 3D-printed miniature for modeling only — not a functional unit. Model scale: **20 in (length) × 4 in (height)** — three modules side by side (about 4 in deep). Production units scale by adding modules in parallel on a small pad.

3D-printed model of CAST media stack lifted from housing — illustrative only, not a functional unit — **Lift-out stack (model).** 3D-printed miniature for illustration only — not a functional unit. Represents how production CAST internals lift out for inspection or pressure-wash when fouling requires it; no moving parts.

Both photos are 3D-printed models used for form-factor and concept illustration only. They are not operating hardware.

Bench documents

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Executive summary — PFAS bench test

Financial and operational highlights · May 2025 · ECT2 (Onterris)

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Technical white paper — CAST treatment technology

CAST pretreatment for PFAS programs · June 2025

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Next: prove it on your water

Bench data informs design. A paid on-site pilot with modular CAST units confirms performance on your influent — plant stays, tee-in only. Field pilot results will be published here as they clear for public use.

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