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The Aquia IV Arc is Toto's two-piece elongated toilet with a dual-flush system: 1.28 gallons for solids and 0.9 for liquids. It uses Toto's Tornado flush and CEFIONTECT glaze, a smooth finish that keeps waste from clinging to the bowl. Universal Height puts the seat at about chair level, which is easier on knees and hips than a standard bowl. It is WASHLET-ready, so a bidet seat can be added later without swapping the toilet. Against basic single-flush toilets it offers two flush volumes and a cleaner glaze; against one-piece models it is less expensive to buy but has a seam between tank and bowl that needs occasional cleaning.
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Lowest price we've seen: $675.95 on Nov 10 at Lowe's. Tracked across 1 store since Nov 10.
Owners of the Aquia line generally report strong, quiet flushes and a bowl that stays clean longer thanks to the glaze. Complaints tend to focus on the two-piece seam and on the learning curve of the dual-flush buttons.
