Why you don't wait 4 years between return pump cleanings.....

[Son Of Skyline]

Yikes! I haven't cleaned my mag3 return in almost 4 and a half years myself. Maybe I should.

[Delphinus]

It should still work even if the magnet is scored up. Bulging is the bigger problem but I don't think Eheims are prone to that.

Muriatic acid will eat the stuff in minutes, but the stuff is nasty to work with. You'd have to get it at a pool supply place, Home Depot and Rona don't carry it. You'd want to dilute it and do it in a well ventilated area - avoid breathing the fumes. Did I mention it's pretty nasty stuff to work with?

[Trevor82]

Rona does carry the acid, not sure about home depot, but yeah it does suck to work with.

[warriorcookie]

Canadian tire has it too.

There's a powder you can buy from your lfs that's meant for cleaning pumps. Works faster than vinegar and safer than muriatic acid. Just add water and soak.

[BCOrchidGuy]

muriatic acid is sold in pool supplies at Canadian tire and with solder supplies at home depot and rona

[gregzz4]

I don't see anything wrong with your pics ... why do you want to clean it ?

Hope it comes out clean
Just goes to show how good our Eheims are

[Aquattro]

With muriatic acid, you really should neutralize it before disposing of it. A box of baking soda works well for that