question test for salt on an existing pool

[Pv2]

Pool is just about 3 years old and I am switching to salt. Ordered the Tayor test and got 2600ppm! Haven't added any salt yet. Is this a normal amount for three years of almost exclusively bleach chlorination?

Looks like I won't have to add much

 

[JamesW]

Seems a little high, but possible.

What's the salt level in your fill water?

How long is your pool open and how much bleach would you estimate you have added total?

 

[Pv2]

good idea! I will test the fill water. open? hmmm mid-March through October more or less (for three years). amount of bleach? rough guess at least 100 gallons? right now I am blowing through a gallon every couple days - it has been so freaking hot - I am adding twice a day.

 

[JamesW]

100 gallons of 8.25 % sodium hypochlorite will add about 2182 ppm salt in a 6,400 gallon pool. Evaporation and refill will also add salt. 2,600 ppm is definitely possible.

 

[Pv2]

ok thanks! that must be it. tested the fill source and got 200 or less - it changed on the first drop.

and most of those 100 gallons were 10% so there is that too.

 

[Pv2]

I guess that might explain why the "back wash bush" seems to be struggling. I guess I better flush the poor thing with some fresh water!