my RO manifold is leaking... brings up the question of glues

[Magnum Man]

so, I have a pvc manifold I assembled , between my pump, and the tanks, this consists of 3 ball valves , so I can divert the water to tanks in 3 different parts of the house, by separate lines... I'm sure I used standard pvc weld to assemble it, but one of the valves has loosened... in theory, this should be strong enough to put a control valve on the end, and be able to close it completely with my adjustable stall diaphragm pump, but I currently just use an open "J" hook on the tank end, to hang the hose on each tank, and have switch easily placed to turn it on or off.. so, no more resistance than pumping the water up to the line running above the ceiling... this makes me question the glue... it should not be dissolving with the RO... so I have to assume I had a senior moment when assembling it, and didn't get it properly or correctly glued... topic thoughts... any glue of this type, should be ok for aquarium use, as far as fish safety... I always worry about carryover to the fish environment (I don't super glue anything in the tank, for this reason... probably an unfounded concern, as long as proper water changes are performed )...

what say you guys, ( and gals )???

 

[anewbie]

ro water is extremely corrosive and pvc is known for leaking forever chemicals with tap water - not sure why you think the glue would not dissolve via ro water but in truth if properly assembled the glue should not come in contact with water.

I presume your valve are pvc 40 or 80 and the glue actually melts pvc and then allow it to dry bound together - as for safety - my comments are above. there is a material called polyp that is used for piping in places like hospitals that is inert (or more inert than pvc) and there are grades of pex piping (not all pex piping is equivalent) that are more resistant to corrosion.

Test: put ro water in some pipes in a glass container (use glass not plastic) and wait a week and watch that tds rise.

As for toxicity to fishes - I don't think there is a formal study. FDA a few years ago warned cities to not use pvc for water mains because it increases the chances of cancer from leached forever chemicals and there is a wide range of fishes with different longevity and sensitivity to toxic chemicals.