We bought our house about five months ago and we noticed that we cannot open two faucets at the same because this will cause the water pressure to drop drastically. The Water heater is about eighteen months old, so I do not think this it the cullprit. We do have a Water Softener (Pure Water with a Economiser 5600 controller head) which seems to be working fine. The previous owners told us that they have not touched the unit in about four years except for adding salt about every three months. I have added 2 40lb bags myself in the five months we are living in the house. I turned the By-pass valve to the by-pass position but the water pressure was still low when we open two faucets in the house. It was even worse when we use the dishwasher, washer or run the irregation sprinklers at the same time. The water pressure is ok when only one faucet is open in the house but it is not what we are used to in the apartment we used to live in. However when we have only the irregation sprinklers running the pressure is enough to run five single stream Rain Birds with no problems at the same time.
Can anybody please share some ideas with me where to start looking for the problem. Thanks.