#cost-analysis

The evidence is a 9 cm² panel run for ~9 hours outdoors and a lab unit run for 7 days. Real deployment needs square-metre panels surviving years of seawater: aluminium corrosion, biofouling, laser-texture wear, mechanical robustness, and field salt-harvesting are all untested.

The levers that make the refill model profitable (route-density engineering, cutoff batching, automation) are the same ones that cut labour per delivery. Higher operator profit and many stable jobs cannot both be maximised, so job creation must be a deliberate, costed choice.

The hotels-first plan assumes a home-refill business grows naturally out of the B2B phase, but they differ in product, sales motion, margins and logistics. Direct-to-consumer also reintroduces the dispersed-household friction the hotel approach was specifically chosen to avoid.

The closed-loop swap shifts reverse-logistics cost onto the operator, who must collect, sanitise and refill containers. Whether the model beats plastic rests on the measured per-cycle cleaning cost (water, energy, detergent, wear, reject rate) and the number of reuse cycles.

Seawater reverse osmosis gives cities a rainfall-independent supply. It works when sized against permanent aridification and framed honestly as insurance with flexible operating triggers; it fails financially through drought-panic procurement and rigid take-or-pay contracts.

The Carlsbad plant (December 2015) is the largest SWRO facility in the Western Hemisphere at 50 MGD, built for about $1 billion under a 30-year take-or-pay purchase agreement with San Diego County Water Authority. It de…

The Victorian Desalination Plant was procured at the height of the Millennium Drought via a PPP with AquaSure consortium. Capital cost blew out to ~A$4bn; on completion in 2012 it went straight into standby and delivere…

Israel built five-plus mega SWRO plants from 2005 onward, now supplying roughly 80–90% of municipal freshwater. Competitive BOT tenders with private concessionaires drove world-record low prices (Sorek B at ~$0.41/m³).…