Purilens Plus Preservative-Free Contact Lens Saline 120ml (4 fl. oz.) 12 Pack

What is the difference between this product purilens plus and the purilens plus saline that costs $15 more?

Is this good as just a rinse in the morning after i use clear care at night to disinfect? i wear gas permeable lenses (i have keratoconus)

Is this 12 pak a saline only or a cleaning system. I wear daily disposables so i just need preservative free saline

Wondering if i can use this product with scleral lenses? wondering if there is a big difference between this product and lacri pure?