In addition to this, everything that enters the body of water; dirt, leaves, chemicals, bodies, pets etc...etc. EVERYTHING has TDS factor, which contributes to the overall rise of TDS in the body of water.

In some regions, i.e.; coastal California, climate is not the main reason for a rise in TDS, rather chemicals being used. Calcium hardness, for example, is the main contributing factor in these regions due to use of Calcium and Sodium Hypochlorite.

When the TDS level of pool water rises, subtle problems will begin to occur: calcium deposits will appear at the pool water line, brown manganese stains, salty taste to water, irritation to skin and eyes, etc.. As the TDS rises higher and higher, these problems amplify to a point where the pool will begin to deteriorate.

At high levels of TDS, calcium will begin to replace the plaster in gunite pools. this will expose itself as a dime sized circle on the plaster. At this piont the calcium deposit at the water line will have grown to resemble a stalactite and manganese stains may be very evident.

Obviously the TDS should not be allowed to rise to these levels. The Solution, given by the pool industry at this time would be to drain and acid wash the pool and soda blast or bead blast the tile. this practice to acid wash a pool is destructive and unnecessary.