A tube frame, a liner, and a volume that is not the one printed
The best frame pools for 2026
A frame pool is a steel tube skeleton holding a welded liner, and it is the shape almost every first pool takes. Three figures are published on practically every listing: the footprint, the wall height, and the volume in litres — and the third one deserves reading twice, because it is not the volume of the pool. Makers state capacity at roughly 90 % of wall height, which is where the water actually sits once the skimmer is in: Intex prints "ca 3.800 l" on a 300 × 200 × 75 cm rectangle that holds about 4 500 l brim-full. That gap is not an error, it is the freeboard, and it is the number every chlorine dose is calculated against. The fourth figure is the one that separates a pool that lasts a decade from one that is re-bought every third summer, and it is published far less often: the liner thickness in tenths of a millimetre, and the tube diameter and wall gauge of the frame. Round pools take hoop stress in the frame ring; rectangles carry it in the corners and need more bracing, which is why a rectangular pool of the same volume has visibly more tube. Then what the set includes, which is where prices stop being comparable: a pool "ohne Zubehör" and a pool "Set mit Filterpumpe" can carry the same model name and differ by a filter, a ladder, a ground cloth and a cover. We compare footprint, wall height, stated and geometric volume, liner thickness, frame tube, assembly time and set contents.