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.
Reducing the Health Risks. Although the Association does not recommend using hot tubs during pregnancy, here are some steps you can take to reduce any risk: 1  Re-program your hot tub to maintain a lower temperature. 2  Limit time in a hot tub to 10 minutes or less.3  Monitor the temperature of the water by dipping a thermometer in the hot tub.educing the Health Risks. Although the Association does not recommend using hot tubs during pregnancy, here are some steps you can take to reduce any risk: 1  Re-program your hot tub to maintain a lower temperature. 2  Limit time in a hot tub to 10 minutes or less.