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.
1 On average a hot tub costs about $1 a day for electricity and chemicals, although this can vary from $15-$60 a month depending on size, insulation, climate and local utility costs. 2  Ask for an estimate of monthly operating costs, as these vary considerably between brands and models. bought a used electrical sub-box for $40 on Craigslist and had the spa professionally wired for $200.00. I set the hot tub on $60 worth of pea gravel. Many people who are moving don't know what to do with their hot tub. Check for used high-end models at bargain prices.