To correctly assess the amount of water loss try the “bucket test”.


Firstly turn the automated system for the pool off and do not use the pool during this test. Place a weight (stone, brick of grave) in a bucket and place the bucket in the pool either on a step or another support so that the bucket edge is higher than the level of the pool. Fill the bucket with water so that the level inside is the same as that outside, i.e. the level of the pool. Leave for 24 hours. The idea is that the rate of evaporation should be the same for the bucket and the pool, so if the level in the bucket is higher than that of the pool, the pool is losing water faster than normal and you have a problem.

Once you have determined that you have a leaking pool, turn off the pool and monitor for 24 hours and make a note of water loss using your bucket as a gauge. Monitor for a further 24-48 hours and again make a note of how far the level of the water has dropped. Has the pool stopped at the bottom of the skimmer unit and remained at that level for some time, because this would indicate that you have a leak in this area. Are the jet outlets, vac point or pool heating face plates still below the water level? If the pool continues to drop and stops at any of these ports is is likely to be the location of the leak.

Other things to look for

  • Have a look at the equipment pad, look closely at the spider valve, the pool pump, pay particular attention to the O-ring on the plastic lid and the rubber seal at the bottom of the pool pump (you may need to use a hand held mirror for this). Check the sand filter, the selector and the general pipe work within the equipment pad area. Check the valve to the waste pipe is working as designed (if your system has one).
  • Check around the pool for signs of wet soil or sunken areas in the soft land and check the hard standing areas around the pool for cracking or movement.
  • Look closely at the ports within the pool and the skimmer boxes for separation or movement
  • Check around the swimming pool light for signs of wear.
  • Look at the fabric of the pool and the steps – are there any signs of movement? Have you seen small deposits of grout on the floor of the pool? Have you noticed grout or small deposits of pool tiles within the pool pump basket that enter the pump unit when you vac the pool? Are you losing tiles from the floor or walls of the pool?
  • Have you noticed bubbles entering the pool from the return line (jets) or have noticed any within the pool pump basket cylinder.

If all of the above seems in order, you have a leak. This is the time to call us for professional help.

Before you call …

We will have assumed at this point you have checked your pool and looked at out leak detection methods above:

  • When did you notice the pool was losing water and have you determined the amount of water loss within a given time frame?
  • Where does the water level drop to or does the loss of water drop below all the inlets/outlets to the pool (other than the sump/drain)
  • How old is the pool?
  • Do you lose more water when the pool is running?
  • Have you lost suction through the skimmer or the vac point?
  • Is the water in the pool cloudy?
  • When did you last change the sand in the filter?
  • Is there air returning to the pool through the “jets”?
  • Is there any other anomaly that you have noticed?

The above information will assist our team in determining where the problem might be. The more information you can give LEAK-TEC before we visit the site, the less time we spend determining your problem (so the less you get charged).