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.
Over 24 hours a spa may only lose two degrees of heat - including typically daily use of approximately one hour. When using a 2kw heater, this two degrees could be regained in just one hour. With a typically energy tariff of 12-13 pence per unit, you arrive at a low daily running cost. Basic hot tubs connect straight to an outdoor waterproof plug socket and are a breeze to install. They require little maintenance, just a small amount of chlorine every couple of days â this will cost roughly Â£50 per year.