I have been getting a lot of questions regarding this topic. Here are the rules for clarification:
From Article VI: Section H (2.) of the CSSCSA Bylaws: On or after May 16, a swimmer may practice only with their summer club swim team and compete only in their summer club swim team’s meets in order to be eligible. To clarify, a swimmer may NOT practice or compete for another summer club team, a year-round team, etc. on or after May 16. Notwithstanding the above, a swimmer may practice or compete on or after May 16 interscholastically or inter-collegiately without losing eligibility.