I'm a big fan of Iota
chargers, too. I have had two of them (DLS-55/IQ4 and DLS-45/IQ4) for over five years, in use 24/7. I've also installed a bunch of them on client's boats.
However, the "equalization" cycle claimed by Iota is NOT a true equalization cycle. It's really a "repeat bulk/absorption" cycle, which never gets anywhere near the 15.5 to 16.5VDC needed for true equalization. It's my one big gripe about Iotas, and I wish they'd revise their documentation
and stop claiming the weekly "equalization" cycle.
I've studied these chargers pretty carefully and they're absolutely the best bang for the buck. However, plate sulfation still does occur at the voltages permitted by the IQ4 smart charge controller, though very slowly.
The Iotas are particularly good for quick charging
during a cruising boat's cycle from, say, 50% to 85% state-of-charge. They're also good for continuous usage at dockside or in solar
Even better life can be had from your batteries, however, if you periodically do a true equalization cycle, using another charging
source which elevates the voltage to at least 15.5VDC to 16.5VDC for several hours. Every six months or so might make sense for a typical installation
I have several chargers capable of delivering true equalization voltages, and I've found that periodic treatment of the batteries normally maintained by the Iota chargers does, in fact, make a significant difference in restoring battery capacity.
Also, not widely known is the fact that the Iota's normal charging voltages can be "pulled" up or down somewhat. For maintaining my T-105 banks, I've bumped the Iota's voltages up to:
15.0 bulk, 14.4 absorption, and 13.8 float.
You would not want to do this unless you are driven to monitor
your batteries carefully.