Reversing Entropy · video

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A Spectra Cape Horn Extreme with an oversized membrane costs $12,000–$15,000 new; the same function can be replicated for under $500 using off-the-shelf parts.▶ 0:24 The transcript strips a watermaker down to its core: an SW30 reverse osmosis membrane (typically a DuPont Filmtec 2540, ~$350 from a reputable supplier), a high-pressure pump, a five-micron pre-filter, a needle valve, a pressure gauge, and a parts-per-million sensor.▶ 3:00 The Spectra system uses a Clark pump — a pressure intensifier, not a true pump — to reach the ~800 psi needed to force water through the membrane, achieving 55 liters per hour on two SureFlow motors at 4.2 W/L, or 32 L/h on one motor at a more efficient 3.6 W/L.▶ 5:18 Removing one of two membranes confirmed that membrane size is the primary bottleneck; prioritizing membrane surface area matters more than motor count.▶ 9:06 Replacing the Clark pump with a $50 Lidl pressure washer still produces 33 L/h but at ~30 W/L — six times less efficient.▶ 14:25 Fake DuPont Filmtec membranes sold on Amazon under the "DAO" label are flagged as a known problem.▶ 4:07 Running one motor slowly through two membranes is more energy-efficient than running both motors simultaneously.▶ 8:48

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