Hello! This is my first pool. It is an 18' round above ground. Sand filter. Filled the pool in mid April, I live in Pennsylvania so we've had some warmer than usual days, but recently below average. About two weeks ago, my ph needed to be increased and also the free chlorine. I added the recommended solution from our pool store and then shocked the pool. Everything was good for about a week. Now the free chlorine is low again, but everything else is good. I have a floating chlorinate. Do I have to shock again? Or should I be adding my chlorine in another way? Thanks in advance!
Raising free chlorine level
- Thread starter Erica
- Start date
Hi and welcome to TFP 
How are you testing your water? We reccomend testing with a good home drop based test kit. Like these
Pool School - Test Kits Compared
Also, have you had the chance to look at any of the articles in the Pool School link at the top of the page? By using a chlorinator with pucks, you are also adding CYA which can get too high over time and make your chlorine much more difficult to manage. Here is a link to some basics.
Pool School - ABCs of Pool Water Chemistry
How are you testing your water? We reccomend testing with a good home drop based test kit. Like these
Pool School - Test Kits Compared
Also, have you had the chance to look at any of the articles in the Pool School link at the top of the page? By using a chlorinator with pucks, you are also adding CYA which can get too high over time and make your chlorine much more difficult to manage. Here is a link to some basics.
Pool School - ABCs of Pool Water Chemistry