When a villa terrace, resort pool deck or private garden courtyard needs a swim spa, the conversation usually starts with length and jet count. For the Outdoor Swim Spa WS-S06CT-L, the catalog sheet gives you a clear starting point: a shell listed at 6670 × 2380 × 1400 mm, a control system and swim training system of one set each, one water pump and one filter pump, a jet total of 31 pcs, four LED lights and a total power figure of 8.35 kW. Those numbers tell you the size of the opening you need to plan for. They do not tell you what the spa is made of, or what it will look like once it is installed and in use. Materials and finishes are what decide whether the unit reads as a considered part of the landscape or as equipment dropped onto a deck.

This guide walks through the material and finish decisions that change the specification of a project-grade swim spa, using the WS-S06CT-L and the wider Swimming Pools and Swim Spas range as the reference point. It is written for the people who place the order: architects, contractors, procurement officers and developers who need to put a defensible specification in front of a client.

The shell decides both the water-holding surface and the visible interior

In this range the shells are acrylic — the same material described for the shaped outdoor spas in the catalog, an acrylic shell with structural reinforcement. Acrylic can be formed into a deep, continuous interior, and it takes a high-gloss surface that reflects light back into the water. That matters when you compare constructions that reach the same result by other means, because every joint and overlap in a water-holding surface is somewhere grime collects and somewhere a finish fails first. Fewer joints in the visible interior is the practical advantage to look for, whatever material the sheet names.

When you compare two shells, ask three questions in this order. First, how is the interior formed, and where are its joints? Second, how is the shell supported — a bare shell, or a shell sitting inside a reinforced cabinet or frame? Third, what sits between the shell and the outer cladding? That last question matters more than most buyers expect, because insulation is a material decision with a running cost attached. Insulation is listed as an option across this range rather than as standard on every model, so the amount and method should be stated on the quotation, not assumed.

The wet edge and the water line

A swim spa is used at the edge more than it is used in the middle. People sit on the rim, swing legs over it, and rest arms on it while the jets are running. The materials at that wet edge age faster than anything else in the build, so treat them as a specified item, not a detail.

• Coping and deck interface. Decide whether the spa will be flush with the surrounding deck, raised on a plinth, or free-standing on an existing surface. A flush installation puts the detail at the junction of the spa shell and the paving under constant exposure to splash, cleaning chemicals and foot traffic. Specify the joint material and the movement allowance with the paving supplier, not after the spa arrives.
• Cabinet cladding. The outer cabinet is the visible exterior of the unit. In this range the cabinets are described as reinforced, and the cladding material and its finish are part of the specification conversation. Match the cladding to the adjacent exterior palette — the same timber tone, the same metal finish, the same stone — so the spa disappears into the terrace rather than competing with it.
• Steps and access. Steps appear as an option in the catalog for this range rather than as a fixed inclusion. If a step is required, its material needs to be chosen at the same time as the cladding, because a mismatched step is the most visible compromise on an installed spa.

Hardware finishes: metals at the wet edge

Jets, fittings, handrails and light surrounds are small areas with an outsized effect on how expensive the finished spa looks. They are also where a project specification gets quietly downgraded, because a finish can look identical in a catalogue photograph and behave very differently two years into service.

Ask what the metal actually is and what the surface treatment is. On this model the jet total is listed at 31 pcs, with four LED light positions, one water pump and one filter pump behind that arrangement, which means there are a lot of small metal penetrations in the shell to reconcile visually. Where the specification calls for a corrosion-resistant alloy, insist that the grade and the finish are named — the alloy itself, and whether the surface is polished, brushed or coloured. Where a coloured or plated look is wanted, ask how that colour is produced and what the maintenance routine is, because a plated surface cleaned with the wrong product can be ruined in a single season. If the sheet does not name the alloy, make the supplier name it before you sign.

The same logic applies to control systems. The specification lists one control set; what changes between projects is the face of that control and how it is integrated — a panel on the cabinet, a remote unit, a wall-mounted interface inside the changing room. Choose the position and the finish of the control before the cladding is fixed, then it reads as part of the design.

Light, colour and finish behaviour at night

Four LED lights are listed for the WS-S06CT-L, and LED lighting appears as a feature across the range. Light is a finish decision because it changes how every other material reads after dark. A high-gloss shell interior throws light back into the water and lifts the whole volume; a darker cladding absorbs it and makes the water the only bright element. Both are legitimate. What you should not do is approve a cladding colour under daylight conditions and then discover at handover that it disappears entirely at night.

A practical way to control this is to review the light and the finish together, in the same sample review as the cladding and the coping. Ask for the LED specification — colour capability, control, and whether the fitting is recessed flush with the shell or proud of it. Recessed detail is more work to specify and much better to live with.

Comparison table: what to close out on every quote

How the WS-S06CT-L sits against its siblings

Once you compare within the range, the material conversation gets easier, because the same shell and cabinet logic carries across models and the real variable becomes the layout and the equipment set. The WS-S06CT shares the 2380 × 1400 mm section and the 31-jet, 8.35 kW arrangement, but at a 5880 mm length rather than 6670 mm — and its listed features omit temperature setting. That single difference is a materials-and-controls decision, not just a length decision, because heating and temperature control are exactly what drives the insulation and cladding build-up.

Move to a different end of the range and the emphasis shifts again. A longer format such as the 10000 × 2200 × 1420 mm configuration in the WS-S10 line carries a higher jet count and a different pump arrangement, which means more metal penetrations to coordinate and more wet-edge detailing. A compact, deeper section at 5900 × 2500 × 1600 mm in the WS-SP600 line behaves differently again — a deeper, tighter volume reads as a spa rather than as a lap channel. Where the brief calls for a shaped or site-specific pool form rather than a catalogue model, the Customizable Shape Outdoor Spa line covers square, round, oval and curved configurations in an acrylic shell with structural reinforcement, which is where the finish specification becomes a genuine custom item rather than a selection from a list.

Specify the finish through the supply route, not after it

The reason material and finish questions bite hardest on imported swim spas is sequence. A spa ordered with a chosen cladding, a named wet-edge metal and a stated insulation build arrives as one assembled object, and changes to it after that point involve the manufacturer. If the spa is being brought in alongside other packages for a villa or hospitality project, the finish decision should be locked at the same point as the joinery, screening and paving schedules, so the spa enters the same drawing set instead of arriving as an unplanned guest. The custom and OEM work the company undertakes covers bespoke material, finish and texture selection with prototyping, and the wider one-stop project supply scope runs from material selection and product specification through production, logistics, delivery and site coordination.

Whatever route you take, put the same five items on the approval sheet before you place the order: shell construction and joint detail; cabinet cladding material and finish matched to the adjacent palette; the named alloy and surface treatment of every wet-edge fitting; the insulation build; and the electrical requirement confirmed for the exact configuration being produced. A swim spa specification that answers those five questions is a specification a client can sign. One that answers only the jet count is a brochure.

SANTERSON manufactures outdoor swim spas, outdoor furniture and building materials in China and supplies project orders internationally. Send the drawings, the target dimensions and the finish references for your pool deck or terrace, and we will confirm the configuration, the materials and the electrical requirement for your review before production.