Right on.. thanks again Ben Zumeta ….So in my tub every inch is 45 litres. According to google every kg of body is equal to 1 litre. Iam 85 ish and wife is 65 ish. So 150 kg. So 150 litres ,so should raise water less than 3 inches. So tub is 39 “ high, will fill to 32, put my hot outlet at 31. Cold inlet at 6”?? What you think ? Anyone? Also did anyone ever put water jets in their DIY tubs?? I was gonna put air jets but someone said air just cools the water, better to use water!