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.
How to cool down the cost of running a hot tub. Hot tubs have become much more energy efficient in recent years, thanks largely to California Energy Commission requirements that took effect in 2009. Yet even with these standards, a hot tub can cost $2 to $3 per day to operate. Experts say it's not worth turning off the tub's heater to save energy between uses; it actually uses more energy to bring the water back up to temperature the next time you hop in.