Aftermarket magnet reccommenation?

[jesspal]

Can anyone recommend an aftermarket magnet, like from amazon that is strong enough to hold up a pump but not so strong that they are hard to work with?

 

[Doctorgori]

Good luck.... I’ve spent a few dozen dollars getting allegedly “STRONG” magnets on Amazon ... trust me the strength of many magnets is overstated ...
You are gonna want it to say 40lbs to hold anything decently heavy on 3/4” glass ....
Not saying 40lbs is the actual strength but at least get one at that “stated” strength

 

[Silent]

The cheapest way to do that is to look for old used algae scrubber magnets and glue the pump to the inside magnet.