King Technology

King Technology spa and pool sanitising parts

King Technology is known in the spa and pool world for the Frog family of mineral-based sanitising systems. Rather than relying on chlorine or bromine alone, these systems combine a mineral cartridge with a sanitiser cartridge so that the water is treated continuously while the pump runs. The hardware around those cartridges — the holders, housings and in-line bodies that keep each cartridge in the right position in the water flow — is just as important as the cartridges themselves, and it is the part that most often needs replacing after a few seasons of use.

Here you will find the parts that keep a Spa Frog installation working as intended, so an ageing or cracked holder does not force you to replace an otherwise healthy system.

The Spa Frog cartridge holder 74500

The Spa Frog cartridge holder, part number 74500, is the component that carries the Spa Frog cartridges and keeps them submerged and correctly oriented in the circulating water of a hot tub. Without it the cartridges cannot sit where the water passes over them, and treatment becomes uneven: too strong at the start of a cycle, too weak later on.

Holders live in a warm, chemically active environment and are handled every time cartridges are swapped. Over time the plastic becomes brittle, clips lose their grip, and the body can crack or discolour. A replacement holder is a straightforward, low-cost way of restoring the original fit instead of improvising with a floating dispenser.

• Cartridge seat: holds the mineral and sanitiser cartridges together as a single unit.
• Positioning: keeps the cartridges in the water flow so treatment is continuous rather than intermittent.
• Handling: allows cartridges to be lifted out, checked and refitted without tools.
• Wear item: replaced when the plastic cracks, the clips fail or the holder no longer sits securely.

Identifying the right part before you order

Frog products are sold under several family names, and the fittings are not interchangeable between them. Before ordering, work out which system your hot tub actually has and compare it with what is listed on the product page.

• Read the part number: King Technology moulds or prints reference numbers on most components. Matching the number is the safest method.
• Check the cartridges you buy: the cartridges already in use tell you which family the system belongs to, as each one is shaped to suit its own holder.
• Look at the location: note whether the cartridges sit in the skimmer area of the spa or in a dedicated housing plumbed into the circulation pipework.
• Measure the space: take the internal dimensions of the opening the holder drops into, so the replacement is not too tall or too wide.
• Photograph the old part: a picture of the holder in place, including any clips or lugs, makes comparison with the listing much easier.

Getting the most from a mineral system

Mineral systems work alongside normal water care rather than replacing it. Test the water regularly, keep pH and total alkalinity within the range recommended for your spa, and shock the water after heavy bathing loads so the system is not asked to do more than it was designed for.

Change cartridges on the schedule the manufacturer sets rather than waiting for a visible change, because a spent cartridge looks much the same as a fresh one. When you replace them, inspect the holder at the same time: check that the clips still close firmly, that there are no hairline cracks around the seat, and that nothing has become distorted by heat. A holder that has gone soft or brittle should be replaced before it breaks and drops a cartridge into the pipework.

Always turn off the spa and follow the instructions supplied with your system when removing or refitting components, and rinse your hands after handling sanitiser cartridges.

King Technology at PoolParthub.com

Here we list King Technology spare parts for Spa Frog hot tub sanitising systems, including the 74500 cartridge holder. These are the serviceable items that keep an existing installation running, rather than complete new systems, so an owner can replace a single worn component instead of rebuilding the whole arrangement.

Stocking the holders alongside other pool and spa spares means hot tub owners across Europe can source a correct, system-specific part rather than a generic substitute. If you are unsure which version your spa uses, compare the part number and the shape of your existing holder with the product details before ordering.