Tunnels Under Vinyl Liner Caused by Frogs

by Dan
(West Point, CA)

Our pool is only two years old and the liner is in great shape.

The tunnels started showing up almost immediately and have been getting progressively worse. I figured out that we have tons of frogs and the big ones can do some serious tunneling!

I don't think the liner will tear, but some of the drop offs are almost six inches! Besides being a trip hazard it is really hard to vacuum or brush those canyons!

QUESTION: Any ideas of products to help clean the tunnels? Are there any other options short of removing the liner and redoing the bottom?

I have captured and removed almost 30 frogs, most of them were as big as a softball, and would fill up a baseball cap. I found some exit tunnels and tried a number of things, but nothing seems to work.
Maybe I just have to live with it.
Thank you for any advice you may have, Dan




Hi Dan. I have heard, and seen, of a lot of things that can cause damage under an above ground pool liner, but this is the first I have heard about frogs.

I was called back to a job once to find out why the sand had caved in. It was an area about 3' x 3'. The customer drained the pool, down to about an inch, and we undid the top stuff and pulled the liner back. Underneath the liner was a large group of big fat ants having a field day with their new home. We used some strong ant killer under the liner and around the pool. We redid the sand base, hooked the liner back up and refilled the pool. We never heard from the customer again so that must have worked.

The key to working with a liner you plan to reuse is to keep a little water in the bottom. If the liner can be pulled back, and repairs to the base made, and the pool refilled ASAP, it might work. Liners shrink real fast, like as soon as they are dry, so unless you plan to replace the liner do not drain it all the way.

When the time comes that you are OK with changing the liner you may consider these options. To cure gopher problems in Arizona a concrete slab is about the only answer. It is a little expensive but very effective.

The 4 x 8 sheets of Styrofoam work great also. They make a perfect pool base and I do not think frog tunneling would affect them any in the long run.

You have many different options for a new base, when the time comes. For now you may consider this handy device.

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