Step 1 We must first find the source of the leaking section. Be sure to turn off the filter pump. Remove the skimmer cover and the pump basket. Inspect walls and interior surfaces for cracks.

Step 2 Inspect the plumbing joints by checking the bottom of the skimmer. Find the area where the plumbing of the pool is attached to the skimmer. Examine carefully for signs of leaks. Leaks could be caused by a poor seal between the skimmer threads and the fitting. If you place your finger in the holes, you should be able to feel where the top of the fitting meets the skimmer's nets.

Step 3 Now we have to examine the skimmer's throat by looking over the edge of the pool in the skimmer's throat. Look for cracked tiles and pay close attention to the corners and joint between the plastic skimmer and the concrete shell of the pool.

Step 4 Repair cracks or breaks in the skimmer walls with epoxy putty designed to go underwater. Epoxy putty is a two-part product in which a resin is mixed with a hardener to produce a sealant capable of filling gaps and cracks. Before applying the epoxy, sand the area around with dry / wet sandpaper to ensure good adhesion. Mix the epoxy resin and hardener to obtain an appropriate amount of epoxy putty. Force the epoxy into the crack and smooth it with your fingers, covering the entire length of the crack from top to bottom and from left to right.

Step 5 Use the silicone sealant to repair areas where the skimmer has moved away from the pool wall, where the corners are cracked and in the cracks of the tiles. These leaks are the result of a cracked crack beam or soil movement of water entering the soil around the skimmer. Silicone sealant is a better choice than epoxy if you suspect that soil movement pressure is the cause of the problem. If the floor or connecting beam continues to move, the soft silicone absorbs motion without cracking or detaching.

Lower the pool water below the skimmer and allow the area to dry. Use a caulking gun or pressure tube to inject silicone sealant into cracks and gaps. Smooth the sealer before putting it in place. Allow the silicone to set in overnight before filling and starting the pool equipment.

If you suspect a leak at the fittings in the skimmer holes, work the epoxy completely around the top edge of the fitting where it is threaded into the hole in the skimmer. Force the epoxy into the threads and on the top of the fitting, and smooth this layer evenly around the edge of the fitting to seal it completely. Be careful not to run the epoxy to the top of the hole - this will decrease the diameter of the hole at the bottom of the skimmer and you will not be able to insert the suction pipe sleeve into the hole to suck up the pool later.