The Orchid Doctor Articles under the Heading Water, Hard

Water, Hard Comments
WATER, HARD: Causes Calcium Deposits on Cattleya Leaves The acidification of water from the hose gradually dissolves the deposits; see method described, A69-126; A71-609 0
WATER, HARD: Characteristics The critical factor is the soluble salt content; over 150 ppm. of calcium carbonate (CaCo/3) is hard, soap does not produce good lather; waters with less than 125 ppm. are excellent; up to 500 ppm. are all right; 500 to 800 are usable with caution. F80-8 0
WATER, HARD: De-ionized Water for Plants For a few small plants one can buy the kind of water sold for steam irons in areas where the local water has a high sodium content. OD79-53 0
WATER, HARD: Deposits on Tree-fern Rafts To dissolve these use a little nitric acid at pH of 4.0 to 4.5; add a few drops of dilute nitric acid to a plastic bucket of water and soak the rafts for 1/2 hour. A75-680 0
WATER, HARD: Devices Available for Removing the Cause There is no simple device for removing calcium and magnesium from tap water; water-softeners create water unsuitable for orchids; demineralization units are expensive; paphiopedilums grow in limestone soils and are not harmed by "hard" water; possible to acidify hard water with citric or nitric acids. A72-204 0
WATER, HARD: High in Calcium and Magnesium Salts Its nature and characteristics and suitability for growing; has high electrical conductance; comments on water-softeners; refer to A67-466+; AH39 0
WATER, HARD: Near Maximum "hardness Index" If the water coats pots and plants with lime residue, perhaps rain water should be collected for periodical use; demineralizer units are expensive but laboratory models are more moderate; address given. A73-709 0
WATER, HARD: Softened with Soda Ash Do not use this on plants. A67-466; A78-812 0
WATER, HARD: With Activated Charcoal to Remove Calcium It will not work; only certain types of organic compounds are filtered out; units for doing the job properly are not cheap; best bet is to catch rainwater. A74-433 0

New Topics

  1. Linda Francis asked question Plant in category General Discussion
  2. Mark Kaczynski asked question Looking for Dendrobium Jac-Hawaii 'Uniwai Pearl' in category General Discussion
  3. Angela Baxter started topic Catt. walkeriana in category Cattleya Alliance
  4. Luis Imatani asked question RLC/ LC Large flowered hybrids in category General Discussion
  5. Bill Overton asked question Phrag. Panther Run in category General Discussion

New Comments

  1. Susan Fairbairn commented on member plant Den. rigidum 'Tom's Image' by Tom Kuligowski
  2. Edward Zapata commented on member plant Cym. Baltic Dew 'Freckle Face' by Edward Zapata
  3. Robert Rand commented on topic "Looking for Dendrobium Jac-Hawaii 'Uniwai Pearl'" by Mark Kaczynski
  4. Steven Kirincich commented on member plant Eny. Exotic Seashell by Steven Kirincich
  5. Carol Holdren commented on topic "Catt. walkeriana" by Angela Baxter
  6. Gonzalo Rotondaro commented on member plant Cattleya (Sophronitis) cerna by Laura Urban
  7. Steven Kirincich commented on member plant Lc. Little Oliver by Steven Kirincich
  8. Robert Rand commented on member plant Alcra. Winter Wonderland 'White Fairy' by Robert Rand
  9. Thuong Do commented on member plant Schom. tibicinis by Edward Zapata
  10. Bill Overton commented on topic "diseases" by Penny Edwards