The figure below shows the two main families of acetylcholine receptors: muscarinic and nicotinic. In structural terms, muscarinic receptors are G-coupled protein receptors, while nicotinic receptors are ligand-gated ion channels. They can be found on both sides of the synaptic cleft (presynaptic and postsynaptic).
After the pressure drops below 40 psi, the electrical switch turns on the pump and the pressure in the tank increases. Any failure in any component or loss of electricity can cause a well to suddenly stop producing water when a faucet is turned on.
Why do you have it & what causes it: Cloudy pool water is a HUGE open-ended issue. You can watch the video here. There is NO SINGLE CAUSE of cloudy pool water. Cloudy pool water is caused by the following conditions: Early algae growth caused by low or inadequate sanitizer/oxidizer levels.