The gardener at our comminity has, in our opinion, caused a crack in the pool sand filter.
We found that after he had vacuumed the pool bottom, he had left the pool with the output skimmer valve for the jets closed and the pump switched on ( the multi valve was in the filtration position). The input skimmer valve was open, the pool bottom drain valve was just cracked open and the input for the vacuum valve was closed.
We checked this out because the jets were not working at the normal time. In the pump house we found water spirting from a crack at the bottom of the sand filter and the pressure valve showed two and a quarter bars.
Naturally we turned the pump off and then questioned the gardener. Not suprisingly he says that he has done nothing wrong and that even if he had left the valves as we said, there is a safety valve to release any built up pressure. We do not know of any such valve.
We feel pretty certain that it is because of the way he left the pool that the sand filter has cracked.
Does anyone have any thoughts on this, both in terms of are we correct in our reading of the situation and has anyone had to deal with a similar problem. Thanks.