[Marianne]

Hello Jamie,

Thanks for the post. The Dow Filmtec low pressure membranes (which are the ones we use) can go to a max pressure of 125psi or .86MPa for you metric folks.

These membranes are rated at 50 psi, 77 degrees F, 250ppm softened tap water, pH of 8.

There are other membranes, such as desalinaztion types, that require high pressures. 600 PSI and higher are not uncommon.

I hope that answers your question, let me know if you need more information.

Marianne