Make sure to change the water in your hot tub every one to three months. This helps to keep the water fresh. Make sure all the chemicals are at the proper levels before you use the spa. If the levels are too high or low, they can harm your skin and the spa itself.
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diffusion of molecules through a semipermeable membrane from a place of higher concentration to a place of lower concentration until the concentration on both sides is equal dialysis Separation of substances in solution by the difference in their rates of diffusion through a semipermeable, membrane. The force required to resist the movement of water by osmosis. Osmotic pressure is essentialy a measure of the concentration of a solution.