WANTED: Pond Pump for 5,000l pond

Basically I’ve made an air bar for the pond and the two way pump I’ve got now doesn’t have enough umph to push air through continuously it’s sort of farting out in stages it’s only a cheap 120L/H one but been needing a decent one for the pond for a while just wasn’t sure what to go with

@48919845273669 what pond air pump would you recommend that doesn’t sound like a 747 and will last longer then six months before the diaphragm turns to dust

It now seems that my air pump has now decided to give up on me aswell 🙄. Anyone local to Oxford have one for sale/spare?

Pond pump wanted for waterfull