Salt System In A Gunite Pool
Posted 09 November 2010 - 01:08 PM
Posted 09 November 2010 - 05:53 PM
1) if the pool is properly bonded, older pools may not be - resulting in excessive corrosion, and
2) stonework/coping that fails - generally softer stones like limestone, etc. (lots of Texas pool owners report trouble and I suspect it has to do with the types of stones easily available in their area).
I'm in Florida and in my work area there are about ten pool owners, all gunite or shotcrete, and all but one are salt pools. YMMV.
Posted 10 November 2010 - 09:14 PM
Posted 11 November 2010 - 02:07 AM
My opinion is that if you use a salt system on a plaster pool, then you will have to compromise on one or both of these things.
Posted 11 November 2010 - 02:09 AM
The clarity of a salt pool and a non-salt pool should be equal. There is no such thing as a "chlorine tint".
the clarity is much greater without the "chlorine tint" and many more benefits.
Posted 23 April 2011 - 12:53 AM
Softer and more porous stones used on some pools as coping have had some issues that may have had some impact from salt. These stone materials are not normally used in the north east as they are are frost proof and don't like our winters.
To check for a bond, look at your pump at the pad. If there is a fairly thick, solid, bare, copper conductor running into the ground, you are the owner of a likely bond wire equipped pool. If you have a multi meter, you can check for continuity to any rail sockets and the deck box for a light(s). If you get 0 or 1 ohm, your good in most cases.
Some pools need an additional zinc anode in the water path if there is a naturally occurring stray current present. This will absorb the current, rendering it virtually harmless. These zinc anodes need to be cleaned of any corrosion annually or every other year and will eventually need to be replaced after 5 to 10 years of use.
Salt cells will change your pool's dietary needs. They essentially create bleach and lye. This can drive the pH up while tabs tend to eat alk and push the pH down. They should also have the CYA level raised from a normal level of 30 to about 70 or 80 in the pool to reduce the On time of the cell, extending it's life. The FC level of a salt cell equipped pool is about 5% of the CYA level vs. 8 to 10% for all others forms of chlorination.
The CSI of a pool should be within a tenth of neutral (0) for a plaster pool, regardless of whether a cell or other method of chlorination is used. This is to prevent calcium scale formation or pitting from the tendency of water to pull calcium from plaster finishes.
A cell's biggest positives, IMHO, is not having to deal with buckets of tablets and their feeders. They also continuously add stabilizer to the water meaning the FC level needed for sanitation and oxidation is increased as tablets are used over time, as is the shocking level needed to free combined chlorine.
There is a substantial amount of salt in your eyes. The salt in the pool reduces the amount of salt pulled from your eyes when swimming with your eyes open. Keeping the pH of the pool between 7.5 and 7.7 keeps the water very close the the pH of your tears. These two factors reduce the irritation caused redness of two similar pools different only in the way the water has chlorine added.
I have fixed nearly every residential pool problem so far. If I can't do it, I know who to call.
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