Salon Backwash Unit

Overview

A backwash unit is the fixture a salon client leans back into for a hair wash: a reclining chair married to a plumbed shampoo basin on a pedestal behind it. The defining geometry is the neck cutout in the Shampoo Basin, the client reclines until the back of the neck rests in the cutout's Neck Rest, placing the whole scalp over the bowl while the face stays dry and upward. "Backwash" distinguishes it from the older forward-wash arrangement where the client bent face-down over a basin, which soaks makeup and is now rare outside barbering.

The unit is two products engineered to meet at one line in space. The Reclining Chair must put the client's neck at the bowl rim for any body height, and the bowl must adjust the rest of the way: its Bowl Tilt Mechanism gives roughly ±15° of pivot so the rim seals comfortably against the neck rather than the client straining to the bowl. Poorly matched chair and bowl heights are the main cause of the neck hyperextension complaints (and the rare but documented vertebral-artery injuries) associated with long salon washes, which is why the tilt joint and a properly soft neck rest are treated as safety features, not comfort options.

Plumbing

Water arrives through a Mixer Valve mounted on the bowl or pedestal, blending hot and cold to the 38–40 °C wash range; listed fixtures incorporate scald limiting because the stylist controls temperature on someone else's scalp. A Diverter Valve sends mixed water to the Spray Head, a fine-rose hand spray flowing 6–9 L/min on a 1.2–1.5 m Spray Hose. Because that spray head spends its life lying in a basin that can fill with contaminated water, plumbing codes require backflow protection: the Vacuum Breaker (ASSE 1001 type) opens the line to atmosphere if supply pressure reverses, so bowl water can never siphon into the potable system. Braided Supply Hose flexibles join the angle stops to the mixer inside the pedestal.

On the waste side, everything is sized around hair. A lift-out Hair Strainer in the Drain Body catches cut and shed hair at the source; what gets past it meets the 40 mm P-Trap, which in salon service accumulates hair-and-sebum clots and is cleared on a schedule rather than on failure. The tilting bowl drains through a short Flexible Waste Hose section into the rigid Waste Standpipe, and the Overflow Channel channel protects against a blocked waste during a running rinse. All of it hides behind the removable Pedestal Cover.

Chair and structure

The chair side is conventional seating engineering with one twist: the recline axis and backrest shape are dictated by the bowl. The Backrest Frame has a deliberately low, cut-away shoulder line so the shoulders pass under the bowl rim, and the Recline Mechanism, ratchet or gas spring, released by a stylist-side Recline Lever, locks at 20–40° of recline. A linked or pull-out Leg Rest raises the calves as the back drops, keeping a roughly horizontal client rather than a folded one; its Leg Rest Slide rails add about 20 cm for tall clients.

Stability drives the structure. A reclined 150 kg client is a cantilevered load behind the seat axis, so the welded Base Frame is long in the recline direction and the manufacturer requires bolting through the Floor Anchor Plate into the slab, Adjustable Foot levellers true the frame first so the bowl rim sits level and water sheets toward the rear-biased drain.

Materials and hygiene

Everything the client and water touch is chosen for daily chemical exposure. Vitreous china basins resist dye, bleach and peroxide staining better than ABS but weigh three times as much and chip; ABS bowls dominate the mid-market. Upholstery is marine-grade vinyl with sealed seams over moulded Foam Core cushions of 50–60 kg/m³ polyurethane, dense enough to hold shape through dozens of clients a day, with the Armrest Pad and Seat Cushion specified as replaceable wear items. The neck rest is removable for disinfection between clients, and gel versions are preferred in long-treatment salons (colour processing can keep a client at the bowl for ten minutes or more) because they spread pressure on the cervical spine.

Variants

Beyond the standard fixed unit, electric backwash chairs add motorised recline and leg-rest drive; compact side-wash units swing the bowl aside so one station serves cutting and washing; and freestanding portable bowls with integral 13 L supply and waste tanks serve mobile hairdressing where no plumbing exists. All keep the same bowl-to-neck interface and the same vacuum-breaker requirement wherever they connect to mains water.