New RO cannister leaking from top.

[Jimbo]

I just upgraded my 4 stage RO/DI to a 6 stage. The first cannister which houses the micron filter has a very slight leak from the top of the cannister. It’s brand new so the O-ring is fine. Tried a little bit of silicone lubricant on the o-ring and still a small amount of water is getting through.
Can I try putting some plumbers tape around where the cannister screws in? It seems plenty tight and I don’t want to overvtighten it. Any other suggestions?

 

[dubge]

I had this happen and it just wasn't tight enough because the filter wasn't seated properly. Have you check that first?

 

[outhouse]

The trick is light sanding on top rim of clear canister. This will let the o ring seal better with more pressure.

if the top is bottoming out that is

Next is too look for any casting marks or lines where o ring sits, these always leak on bulkheads