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UNDER-SINK RO
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Thunder© Series — 12 to 17 stages of under-sink reverse osmosis. The gold standard for residential drinking water purification.

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Under-Sink RO
Thunder© 1000C Under-Sink RO (12 Stages)
12-stage UF + RO. PFAS, lead, fluoride, arsenic removal. Designer faucet and 3.2-gallon tank included. Standard pressure installation.
12 StagesStandard PressureFaucet + TankPFAS
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Under-Sink RO
Thunder© 2000C Under-Sink RO (13 Stages)
13-stage system adding an alkalizing mineral post-filter to restore beneficial minerals and raise pH after RO treatment.
13 StagesAlkalizing Post-FilterpH BalancedMineral Rich
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Under-Sink RO
Thunder© 3000C Under-Sink RO (14 Stages)
14-stage with dedicated coconut-shell GAC post-filter for microplastic, nanoparticle, and pharmaceutical trace removal.
14 StagesCoconut GACMicroplasticsPharma Traces
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Under-Sink RO
Thunder© 4000MP Under-Sink RO (17 Stages)
17 stages with built-in booster pump. Best choice for low water pressure homes. Maximum contamination removal including microplastics and nanoplastics.
17 StagesBuilt-In PumpMicroplasticsLow Pressure OK
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Under-Sink RO
Thunder© RO with Fluoride Exchange Stage
Standard Thunder© RO system with an additional dedicated fluoride reduction stage using activated alumina ion exchange. Optional add for any Thunder model.
Fluoride RemovalActivated AluminaIon ExchangeAdd-On Stage
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Under-Sink RO
Thunder© RO with Arsenic Exchange Stage
Thunder© RO with dedicated arsenic removal stage. Handles both Arsenic III and Arsenic V. Achieves EPA MCL of 10 ppb.
Arsenic III & VEPA MCL 10 ppbAdd-On StageWell Water
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