Can I replace a pond liner in spring?

I can't help regarding pond liner Robert as only have a couple of prefabricated ponds one of which I had to clean out a couple of weeks ago as feared predators of my frog spawn ... I simply & carefully transferred plants & baby goldfish to a container using original pond water,cleaned the pond of mud & excess algae, replenished with clean tap water plus Aquasafe & put all back in plus a new batch of tadpoles, all seem healthy ... never did find any Newts or Dragonfly larvae or Great Diving Beetles!

Hello Robert,    ideally, as you say, it is better to do this work during autumn months, however, if it is a case of having a pond completely drying up when summer arrives you will be saving more creatures by replacing the liner.    My only suggestions are to try keep as much of the original pond water as you can by using water butts or as large containers as you can find.     If you have rocks or stones in the pond, maybe keep these semi submerged even if you have to use tap water temporarily until you can put them back into the pond  using something like Wendy mention with Aquasafe or similar which will help resolve the chlorine or other chemical issues with tap water.    Pond plants the same.

Before adding new pond liner I would try add 6+ cm. of sand to the soil base of your pond area and a fleece liner on top of the sand if you can as this will cushion the liner from sharp stones or such piercing the new liner.    A good quality butyl liner on top of the sand and fleece will give you years of service.      Once liner is replaced just gently pour the saved pond water back an the stones/plants, etc.     Good luck and enjoy your refurbished pond !