You've got to be kidding with that answer!?!? You have no business in a room where water chemistry is being talked about. 7.0 pH is neutral pH. It won't hurt anything.
On the other hand, the ASM Handbook points out that high TDS water through a heat exchanger will result in impingement and erosion corrosion, which is why all the heat exchangers have started failing since salt systems came along. It's probably the reason that somebody asked this question. And why pool heater warranties have plummeted from 5 years to 1 year since about 2004. What I coincidence! Huh? Imagine that...
Here's a link to the ASM Handbook where you can read all about these kinds of corrosion:
http://books.google.com/books?id=idIWxNnH3iIC&pg=PA999&lpg=PA999&dq=impingement+corrosion&source=bl&ots=7ubxPY3a9C&sig=FPg0JS9xZm-qCPsGmPaEpRN8sTk&hl=en&ei=CIWySc_AJYmcMv25qecE&sa=X&oi=book_result&resnum=10&ct=result#PPA998,M1AnswerSalt water should not have any major effects on your pool plumbing since the levels of salt are so minimal. The damaging effects to copper plumbing would be from acidic conditions - pH readings of 7.0 or lower and total alkalinity readings below 80 ppm.
Burst water pipes and water heaters busting are covered for the damage caused inside the house if its sudden and accidental, but the pipe or water heater themselves are not covered as this is maintenance. This is generally not a problem as the damage is more severe than the piece of pipe. Outdoors is going to be more of a problem as the damage is nothing anyway. More information is needed to give you a complete answer. Are you talking about sprinkler system, pipes in a pool house for the pool, or other pipes. Cause is the issue in question as well.
It can crack the pool and any pipes that has water in them that freeze. a way of protecting the pool is to float drums in a line along the middle of the pool there by leaving an unfrozen track along the middle into which the ice can expand. You should definitely empty the filter and exposed water pipes.
Water freezes at 32 degrees Fahrenheit (which is 0 degrees Celsius). The factors which might change the temperature at which your pool pipes may freeze are: - other materials (such as salt) which are dissolved in the water - the rate of flow (if any) of the water through the pipes - the pipe diameter - the insulating properties of the pipes themselves - whether the pipes are buried underground Good luck with your pool!
Low pH causes more damage than chlorine on copper plumbing. Nonetheless, high chlorine levels, sulfur compounds, metal scavengers and the high salt levels from the spent chemicals are all erosive to copper piping. Flow velocity is also a key factor in determining the rate of erosion. At 7gpm expect no more than 10 years life for 1" type K (very heavy) copper, 5 years or less for type M (typical low budget) copper. Copper pipe is not recommended for pool plumbing. Cupronickel alloys that do not contan zinc or tin are corrosion resistant in pool water, as are 300 and 400 series stainless steels, some more so than others.
I don't know, because it is not true the amount of salt that is used in a salt water pool while slightly more corrosive then fresh water (About the same amount of salt as you find in tears) will not cause any appreciable damage to modern pool equipment as it is made for salt water pools, salt water pool being by far the most common pool these days.
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