RO/DI Help - pressure drops & raises every 10 seconds

[VelasCorals]

Just like the title says. Never had this happen before and have been using RO/DI systems for the last 10 years.

The pressure will rise up to around 60psi and for a second or two then drop down to zero. 10 seconds later it will raise back up to 60 and then drop again.

Anyone have an idea of what might be going on?

Filters have been changed a few weeks ago it was working just fine.

 

[BlueCursor]

I assume the pressure is pre-filter.

Really sounds like a questionable filter. I suspect the RO membrane, but I am guessing. Could be one of the pre-filters is overly resistant, then pressure builds enough and water runs through. Of course, the only way to trouble shoot this is to change one water filter at a time.

 

[VelasCorals]

I assume the pressure is pre-filter.

Really sounds like a questionable filter. I suspect the RO membrane, but I am guessing. Could be one of the pre-filters is overly resistant, then pressure builds enough and water runs through. Of course, the only way to trouble shoot this is to change one water filter at a time.

Okay cool, I'll try that. Thanks