You are extremely misinformed. The ICP is stating chlorine as chloride. It is not saying he has actual bleach in his tank.I first noticed the Si
That causes problems
Then the Chlorine
Oochie momma
Everyone is suggesting water change. Odds are that's where the Chlorine is coming from
Make sure your DI cartridge is going the right way.
Maybe change the RO membranes, how old are they?
Send an ICP of your fresh made salt water while you're at it. That will give you a clue as to where stuff is coming from
(Maybe someone sprayed bleach in your tank, known to happen)
Silicone is not the same as soluble silica. The soluble silica will be much less than the total silicone (from seams etc).