report purified or distilled water helps their plants grow
faster. Perhaps due to sodium and heavy metals found in hard
water that are not present in purified water. Hard water tends
to build up alkaline salt deposits in soil that lockup trace
minerals, and cause iron, copper and zinc deficiencies. There
are several types of purified water, but many are not free of
minerals that could be causing salt buildup over an extended
period of time.
Tap water comes in
two flavors. Hot and cold. The cold pipe has less calcium and
sodium buildup in it, and should be freer of sediment once the
water has been turned on and allowed to flow for 30 seconds. Hot
water will have rust, lead deposits, and lots of sodium and
calcium, so much so, you will see it easily. Use only the amount
of hot water needed to make the water the correct temperature
(70-80 F). Tap water filtered through a carbon (charcoal) filter
will be free of chlorine and most large particles, but will
still contain dissolved solids such as sodium and heavy metals
(lead, arsenic, nickel, etc.).
water will be either Reverse Osmosis or some form of
carbon/sediment filtered water. When purchasing water at a
store, unless it says RO or Distilled, don not bother buying it.
It could still have the same dissolved solids and heavy metals
your tap water has.