I have brown powder-like stuff repeatedly forming in the lines of my liner which dissipates on touch. I have treated for Algae three times now but even after cleaning to waste(thanks for that) it is persistent. The water chemical readings are all good but the salt is now 2.10 What can I do about this brown stuff. I am at the end of my tether!! This only forms when the pump is on.
You may have to scrub inside the lines with a brush to kill the algae that is hidden in the porous spots. Put some algaecides directly on the brush periodically to ensure the algae is being destroyed.