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.
Q: How fast will my hot tub heat? A: Depending on the size of the hot tub, the amount of water it holds, and the type of heater installed in the spa, this time will vary. However, it is important to know that above ground portable spas with electric heaters do not heat quickly, as many gas-heated gunite spas will. On average, a spa will heat about 5 - 7 degrees Fahrenheit per hour using a 6kw heater on 240V. Back to Ask the Spa Experts.