If your curls have not been right since the day you straightened and jumped in the pool TBH the flat iron is likely more at fault than the pool water. Although chlorine won't help your hair's health you cannot kill your hair in one swim, you absolutely can in one session with heat, all you need to do is use too high a temperature or straighten even slightly damp hair. Have you stopped flat ironing now?
2a-2c, medium texture, porous/ colour treated. Three years CG, growing out mechanical and chemical damage = breakage and very high porosity. Past armpit length heading for waist.
CO-wash: Inecto coconut
Treatments: Komaza Matani, coconut oil, Hairveda Sitrinillah
Leave in: Fructis Sleek & Shine (old), Gliss ultimate volume, Inecto argan
Styler: Umberto Giannini jelly, Boots Essentials gel
Experimenting with: going back to basics