May 23, 2020

Yellow Sand Wasps

Mention of a wasp is enough to make you fear. They deliver painful stings. One of the species of wasps is Sand Wasps or Bembix. They nest in the ground preferably in the sand. These live in urban areas, forests and woodlands. Adult sand wasps feed on nectar but most hunt for flies to feed to their larvae in the nest. They are excellent hunters, capturing flies on the wing, paralysing them with venom in mid-air and carrying them back to the waiting larvae. Sand wasps can deliver painful stings only when they are disturbed. I spotted these wasps many… Read More »Yellow Sand Wasps

RO Water Purification Systems

Potable Water in many places contains undesirable impurities like suspended solids and harmful organisms like bacteria and viruses. On the other hand, its chemical composition depends upon its source. RO water purification systems claim to do remove the suspended impurities. This is done using sand filters also called the pre filters, and killing the harmful organisms by UV light. Next these bring down the total dissolved salts TDS to desirable levels if the water under treatment has excess TDS. Why TDS ? Why not adjust the concentration of individual ions present to the desirable levels? This they can’t do. These… Read More »RO Water Purification Systems