I Can Hear Water Running Through Pre Filters

[Tuffers]

First time I've heard the water running through them since I went RO. Just done a flush and noticed it and when I closed the valve off. My TDS coming out of the membrane has gone down to 012PPM form 014PPM. Water pressure is the same.

Calling @spruce or @doug atkinson

 

[spruce]

I always hear that noise. Its like a toilet cistern or our header tank filling up. It could be that you have restricted the water flow through the waste valve more than you have previously.

You just must ensure you have a reasonable flow of water to waste.

 

[Tuffers]

I always hear that noise. Its like a toilet cistern or our header tank filling up. It could be that you have restricted the water flow through the waste valve more than you have previously.
You just must ensure you have a reasonable flow of water to waste.

No, I noticed the noise when flushing.