How to choose a health faucet or jet spray
A health faucet is held in the hand on a tube. A jet spray is a fixed steel nozzle under the toilet seat that sprays without holding anything. It does the same job as a bidet spray, but it fits under your existing seat.
Brass health faucets are heavier, with a chrome finish. ABS ones are light and come in white or chrome. Jet sprays come with a 2 feet or 1 meter tube; pick by the distance from the water point to the toilet.
To install one you need a water point near the toilet: an angle valve, a two-way angle valve or a two-way bib tap.