Observed arrival · 2026-10-10
Subfield’s Retrofit for the Septic Tank You Already Have
Subfield presents an in-development treatment system designed to retrofit certain existing concrete septic tanks, with reservations offered by order request.
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- Homeowners considering upgrades to existing concrete septic tanks
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- The page says compatibility, treatment capacity, approvals, and service intervals have not yet been released.
Field notes
The proposed treatment path separates settling into the first tank compartment from aeration and lift-out media in the second, followed by UV and pump dosing. The page emphasizes that every in-tank part is intended to pass through two standard 24-inch access ports, while noting that the pictured setup is illustrative and the sectional aeration rack remains in progress. Local permitting requirements apply.
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Editorial observations of this landing page, not a rating.
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