Went from Tropin Marin Pro Reef to ESV and couldn't be happier... consistency is everything and I can count on the exact same numbers with every salt mix. Mixing four items is super easy considering how fast the water is ready to be used.
Used to use Kent but then switched to Red Sea Coral Pro and I am very happy parameters are amazing I do 5g wc every 5 days and I don't even have to dose my 75g.
I started using ESV after reading Jake Adams articles about it here and here. Incidentally I ran into him at MACNA and asked if he was still using it or if his opinion on the salt had changed. His response, if I recall correctly was something to the effect that he still liked it but wasn't using it because of it being hard to source in his local.
I've switched all my maintenance clients over to it as well. It seemed to me that I was getting little diatom blooms from time to time which coincided with TM water changes and I believe I recall reading about others posting about similar results.
Mixes fast
Mixes clear
Apparently less stressful on corals with WC
Cons
Pricey
I repeatedly attempted to contact the company via phone and e-mail with some questions I had at one time and NEVER received a response. Perhaps there was a logical explanation but from my perspective it is unacceptable in my opinion. Doesn't change the fact that the salt mix is a quality product.
Over time one ends up with 9 gillion sets of the included, and in my opinion, uneeded plastic measuring scoops
I have been using ESV and love it. However in prep for a new larger build, I am testing IO for ten gallon water changes every other day on my 160. That being said, I think I will always keep some ESV on hand for emergencies
Red Sea Coral Pro salt for Accelerated Coral Growth Red Sea Salt - Ideal for mature reef and low nutrient systems
[video=youtube;dubgxB28lns]https://www.youtube.com/watch?v=dubgxB28lns[/video]
I used Reef Crystals for years thuoght the brown scum residue was just part of it.Changed to Seachem and love it PARS are always dead on as advertised.