I also change it every 2 weeks

The following: you need to gather your own experience and common sense. Each region has its own water quality and water hardness. In the whirlpools it is recommended to change the water after approx. 2 to 3 weeks. This way you will always have clean, quality water in your whirlpool. After all, it is for relaxing and unwinding. In contrast to pools: the water is changed 1 to 2 times per season. Depending on the size of the pool. I am an Intex consultant and represent them throughout Switzerland. I will be happy to answer any further questions. LG.