Start with the pool: size, shape and steps
Dimensions are the biggest single factor. The width of the pool sets the length of every slat; the length sets how many slats there are and how much torque the motor must produce to move them. Scaling up is not linear — a longer pool needs a heavier-duty roller and a larger motor, not simply more slats.
Shape comes next. A rectangle is the simplest case: the slats travel in one plane from end to end. Kidney shapes, Roman ends, curved corners and steps built into the shell each need a solution designed around them — shaping the slat pack to the outline, or placing the roller on the straightest run of water. After 5,000-plus installations we have seen nearly all of them.
Every cover we make is motorised at 230 V — there is no manual version — and every one is built to comply with NF P90-308, the standard governing slatted safety covers in Europe. That is part of the product, not an upgrade: the slat locking and the safety performance of the closed cover are in the specification you are quoted for.

