Add bleach!

Running boost shortens the life of your SWCG; they really work best MAINTAINING chlorine levels in pool water that's in good conditions, then they do cleaning up messes.

Getting a good testkit can help us . . . and YOU . . . figure out WHY it's running low.

+ Here are links to the kits we recommend:
HTH 6-Way Test Kit @ Walmart
Taylor K2006A (3/4 oz bottles) @ Amazon
Taylor K2006C (2 oz bottles) @ Amazon
Your pool has PF of 27, so each gallon of 6% bleach will add about 13 ppm of chlorine to your pool. If it's low, but there's no slime on the sides or visible algae, add 1/2 gallon of PLAIN big-box store brand* 6% (check the %) bleach. If the sides feel slippery, or there's algae add 1 to 1.5 gallons.

*PLAIN Clorox brand bleach is fine, but you have to be careful to avoid all the various gooped up versions of Clorox, so we no longer recommend it -- we've had too many people end up with soapy pools because they got one of the gooped-up versions of Clorox.