Bottom, LOL
https://www.youtube.com/watch?v=hBJ_FDcCwTU
Marlig Fix-A-Leak Pool and Spa Leak Sealer - 32 oz
by Marlig Industries
They have liner repair kits at Lowe’s or Home Fepot...
I have used marine epoxy on pool liners before with some success.
It is a two part epoxy, green and white.
You mix it in your plastic gloved hand and then apply it over the hole.
Should seal right up.
It will work as a temporary fix.
Cost is about $5-7.00.
A good hardware store will carry it.
I had one do that years ago. Turned out to be bermuda grass growing up thru the bottom because I did not kill it and put down 3 inches of fine sand.
Solution, get new liner because it turned out to be an invasion.
When I leak from the bottom, I use Depends.
Pool Bursting
https://www.youtube.com/watch?v=uVrxXfzsD7Q
As a temporary measure, simply place a thin piece of plasticlike a free grocery bag, or those thin bags they supply at the produce section of a supermarket. Put something flat on it, and weigh it down.
I hope you are not worried about losing the water? Its not like you are in commifornia! Just keep refilling it. You’re in Canada for pete’s sake! lol
I actually work in the pool industry...
This is an above ground? What the diameter and wall height (48, 52 or 54?) I can tell you the gallons.
You have gotten a lot of good advice (and some bad on the this thread). Pool stores should ALL sell vinyl adhesive patch kits. They have a clear price of 20g vinyl and an under water adhesive. Cut the patch much bigger than needed, rounded edges. Place heavy amount of adhesive on the cut clear vinyl patch. Fold it (make it a glue sandwich) and open the patch under the water. Use your foot to rub out any air bubbles. The adhesive “melts” the two pieces together.
Now to the problem they caused the holes in the first place. Do you have any plants landscaping the pool surround? If so, could be a tap root. Also it could be termites (a common issue under liners). How old is the pool? Is there rust on the bottom track or wall? If so, very hard to repair—if not, order a new vinyl liner.
To prevent the problem in the future, you can place one of two professional products over your sand bed (as a barrier between sand and the liner). One is a product called ArmorGuard (used in asphalt work). It’s a black fabric that is impervious to rocks working their way thru as well as roots. It comes machine sewed together in one big circle, oval, etc
Another product is called “Happy Bottom” and it’s. Foam strips that you tape together—cheaper, but a little more work for the installer. Does the same prevention as Armor Guard.
Good luck...and when you repair (or replace) the liner, make sure you balance oh, alkalinity and calcium (low or NO calcium hardness can cause liners to become brittle).
Put yourself in a 6 foot balloon and watch what happens!
https://www.youtube.com/watch?v=NMbM-ERy2Lk
Depending on age/condition of liner, might consider new one unless it's an isolated spot.