Tunnels Under My Pool Liner

by Mark Despain
(Kentucky)

I have some tunnels that seem to be getting worse under my pool? We are getting ready to replace the liner. What measures should I take to prevent this from happening again? Thanks



Hi Mark. Tunnels under the pool liner can be caused by any number of things. Getting the old liner out and examining the pool base would e the first step.

If the tunneling is caused by insects, bugs or ants the method of treatment might just be a good dose of bug killer inside the pool and out. Green Day makes excellent products that when used around the outside of a pool on a regular basis will keep all the little crawling things out from under the pool liner.

If the tunneling is caused by animals like moles the problem is a little more serious. You may find that several layers of black plastic under your sand will take care of the problem. I have known people with recurring mole damage to pour a concrete slab to put the pool on.

You may find something totally different. You may also decide all that needs to be done is the sand base smoothed out again and the new liner installed.