Â· Modern Use. Today, basalt is used to a lot of things. Most common use of. is as aggregates. Basalts that are crushed are used for construction purposes, like asphalt paving, concrete aggregate and rock filtering agents. Basalts are added as aggregates to increase strength to concrete. Modern Use. Today, basalt is used to a lot of things. Most common use of. is as aggregates. Basalts that are crushed are used for construction purposes, like asphalt paving, concrete aggregate and rock filtering agents. Basalts are added as aggregates to increase strength to concrete.
Typical filtration cycles are four hours, twice per day (for hot tubs operating a single or two speed pump). Reducing the cycles to 3 hours twice per day will save water pumping energy. These circulation times should be set for off-peak hours. (Some hot tubs have small, low wattage circulating pumps that run 24 hours a day. Typically these draw less energy than a 100 watt light bulb.
Hot tubs are generally kept between 100 and 102Â°F (38-39Â°Celsius), with a maximum temperature of 104Â°F (40Â°Celsius). Children under 5 years old, however, should not be exposed to hot tub temperatures over 95Â°F (35Â°Celsius), and should not be in a hot tub longer than 5-10 minutes at a time. Pools for competitive swimming are generally kept between 77 and 82Â°F (25-28Â°Celsius). Recreational pools may be set as high as 84Â°F (29Â°Celsius).