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# Salt Passage Reverse Osmosis Calculator

The salt passage describes the total quantity of salt that passes through the reverse osmosis membrane into the permeate stream. It is the reverse/inverse of the salt rejection. A system performs better when it has lower salt passage. A high passage means the membrane needs replacement. An online Salt passage calculator to find the salt passage rate. This Salt passage reverse osmosis calculator needs the total dissolved solid product and solid feed as inputs for computation.

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The salt passage describes the total quantity of salt that passes through the reverse osmosis membrane into the permeate stream. It is the reverse/inverse of the salt rejection. A system performs better when it has lower salt passage. A high passage means the membrane needs replacement. An online Salt passage calculator to find the salt passage rate. This Salt passage reverse osmosis calculator needs the total dissolved solid product and solid feed as inputs for computation.

#### Formula:

s = (p / f) × 100 Where, s = Salt Passage p = Total Dissolved Solids Product f = Total Dissolved Solids Feed

### Example:

Calculate the salt passage percentage based on the total dissolved solids product of 100 and total dissolved solids feed of 35.

#### Solution:

s = (100 / 35) × 100
= 285.7143 %