Important About Swimming Pool Stains  

by Pool Builders on 05-15-2011 in Articles

MOST, not every staining on pool surfaces are preventable. The issue is most individuals do not understand they have metals in their drinking water. Even trace amounts of these metals (iron, copper, manganese, cobalt, silver) can cause staining. In fact there's adequate copper in A single penny to absolutely stain an common sized swimming pool! Naturally, the problems have to be ideal. This is where prevention & good, right pool care appear into play.

Here's what takes place: metals arrive into your pool each time fresh new, make-up h2o is extra. They're dissolved in the drinking water. Whether or not it's municipal drinking water or well h2o, metals can be current. As the metals accumulate, the greater the opportunity that they will at some point come out of remedy. Once out of remedy, they make the drinking water cloudy or worse, they "plate out" on the pool's surfaces & stain. Metals can occur out of solution as a result of a selection of strategies. But there's 2 that usually take place.

When a pool is shocked whether or not with chlorine or a non-chlorine oxidizer, the shock oxidizes every little thing in the drinking water, including metals. Oxidized metals turn out to be "rust" in the situation of iron or "Verdi gris" in the scenario of copper.

In the second way, metals occur out of remedy or are left "exposed" when the pH, Complete Alkalinity and/or Calcium Hardness are left unchecked & allowed to go reduced (pH beneath seven.two, Total Alkalinity below 80 ppm [non-Pristine Blue pools], Calcium Hardness below 100 ppm). The drinking water becomes aggressive & the metals are more vulnerable to oxidation. In quite a few scenarios, pool-owners don't properly examination their h2o & more probable depend on the "look" of the water (the water's clear, every thing should be alright). This is typically the situation with blonde hair turning green - very low pH helps bring copper out of option & "plates" it out on the person's hair! Then individuals blame the chlorine! It is really the copper in the drinking water.

When it comes to testing, don't forget that you can only test for metals when they are in resolution. Once oxidized, the metals appear out of resolution & can not be tested. That's why the moment a metal stain has occurred, the metal examination will NOT show any metals existing.

Here's how to prevent metal stains:

Keep the water balanced. pH 7.four - seven.6 Total Alkalinity 125 - 150 ppm (vinyl pools), eighty - 125 ppm (plaster / gunite pools) (Please take note that these TA values ARE NOT applicable in Pristine Blue treated pools the place the TA is to be preserved at no greater than 80 ppm) Calcium Hardness 200 - 250 ppm (vinyl pools), 225 - 275 ppm (plaster / gunite pools). In other words, have your water professionally checked at opening, mid-year & at closing (at minimum) - make confident they do a copper & iron examination.

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