I don't have a water level sensor and I have to manually turn on water almost twice a week. I received an estimate that if I install a underground sensor, it will cost about $1,300 (because of the digging involved and the concrete pool deck). I searched on the internet, the Pool Sentry Water Leveler M-3000 does not have good reviews. The Pool keeper seems to have a better review. The cost is less than $100 for each. Are there other good sensors that I should consider? Anyone has experience with Pool Sentry or Poolkeep that you can share? Thanks.