Www.genesisreefsystems.com
Any input? Pros, cons? Worth it? Look at it for water change- auto top off.
It is by far the best water change solution on the market. Hands down! You will not find a more flexible, accurate, fast and easy to use water changer. I have th Renew Pro and have been using it for a number of years and LOVE it. The fact that you can do 1-99 gallons a day, week or at once and have it repeat simply with the push of a button can't be beat. I have mine doing 5 gallons a day and it works like clock work, doesn't require calibration and just does its thing without ever needing intervention. If i want to do a large water change, I enter the number of gallons I want to change, set it to continuous, hit start and walk away. It does 1 gallon every 3 or so minutes and it's always spot on. No calibration and as long as the metering bins are mounted level, there is never any salinity drift and never any calibration needed. You will not beat the Renew for auto water changes. Period end of story.
Their Storm ATO change is a great device too but I use my Apex in conjunction with high quality redundant float switches for the ATO along with an industrial 90 GPD Stenner peristaltic pump for the water transfer duties. I find the Apex to provide enough fail safes to safeguard against issues. If my salinity is too low, if there is water on the floor, if there is too low of water or too much water in my sump, my ATO is shut off and I get a notification. If my water level is too high, too low, water on the floor or my salinity is too high or too low, my Renew is shut off and I get a notification. The Stenner pump is bullet proof and the ideal pump for turning on and off several times a day for ATO duties. My apex is programmed such that my redundant ATO float switches need to sense low water level for 3 continuous minutes before the ATO is activated. This gives the Renew enough time to complete the water change without triggering the ATO. It also prevents the ATO from turning on because of splashing the sump or filter sock swaps. I also run my ATO pump for a minimum of 15 minutes which allows the ATO to top off and add just enough extra water so as to insure that my pump doesn't turn on and off more than it needs too. That extra run time doesn't really impact my sump level noticeably because of my sump size but it does reduce the frequency at which the ATO runs. The other advantage of using a pump like the Stenner in conjunction with the Apex is that the Stenner pump is slow enough that if something went wrong, the chances of flooding your system with fresh water is slim to none because the Stenner pump adds water slowly unlike a typical Eheim pump that the Renew and Storm require.
As such, for me, as a water changer, there is nothing better than the Renew. While the Storm for ATO does integrate nicely with the Renew, I prefer the Apex for the ATO for the reasons I mentioned.
Again, there is nothing better than the Renew for auto water changes. Nothing. This is fact, not conjecture or opinion.
As for Mikes comment above about too much that can go wrong.. I'd debate that one. Four years of the Renew and 2 years prior with a Litermeter 3 doing AWC's and not a problem so far. I wouldn't run a large tank without one. Same can be said about my Apex. With a controller like an Apex, it will act as a very reliable and robust fail safe for your water change device. My tank has NEVER been healthier because of it and one thing I have found after nearly 30 years in this hobby is that smaller daily water changes makes for a healthier system than larger weekly ones because you aren't allowing nutrients to build up over the course of the week.
Now that said, I run mostly bare bottom and have insane flow in my tank that is designed to not allow detritus and waste to settle on the bottom of the tank. With a sand bed, somewhat regular vacuuming is needed and should be performed regularly and you should also have sand critters to help reduce waste. Things like sand stars, fighting conchs, diamond gobys etc all play a role in helping reduce detritus along with good flow across the sand bed. The regular vacuuming will play a role in water changes as well but daily incremental changes are always a good thing.