The tomatoes developed by UF are listed here in this document: http://edis.ifas.ufl.edu/pdffiles/AG/AG21300.pdf. They grow great here, they just don't taste great. Some tasty hybrids do well here - just not growing in unamended soil in the ground.
Chloramine, on the other hand, is a combination of chlorine and ammonia. While chlorine dissipates and evaporates into the air relatively quickly, chloramine is more stable and will last longer in the water system. The goal is to provide increased protection from bacterial contamination.
Monochloramine is the desired chloramine, as dichloramine and trichloramine are less stable and have a distinctly offensive odour (NHMRC, NRMMC, 2011). Figure 1 below is the chlorine breakpoint curve which shows the measured chlorine residual changing with an increasing chlorine dose and constant ammonia concentration. The chart is divided into three sections. For chloramine disinfection, the main focus is on Sections I and II of the curve.