I'm sure someone will disagree, but chargers with dials to set the charge are dinosaurs and have led to many a ruined
battery. I have replaced lots of them, along with the
batteries. If you do use one, get a voltmeter to see what the exact voltage it is set at with the dial and make sure it matches what the battery maker recommends.
Some manufacturers of
batteries, FLA not sealed, will say to condition or equalize monthly (e.g. Trojan) but I have found that most owners will not do it that often as it is a PITA. You have to remove all the caps and
monitor the acid
water level the entire time as they will bubble and expel both gas and
water. The hydrogen gas is very flammable so you have to be very careful with sparks/open flames as well when doing that, with good ventilation. You often get battery acid sputtering out of the tops so you have acid on top of the batteries which may run down the sides in to the battery pan/box. So most will either not do it at all, or much more infrequently, than recommended.
I don't believe non-AGM sealed batteries should ever be equalized. AGMs can be per battery manufacturer recommendation only.
Chargers are not inexpensive, but my recommendation would be to replace a dial-set type
charger with a more modern one, which are usually set by switches with are pre-set for various
charging profiles. All those who have used their dial chargers successfully, kudos to you and keep on with what floats your boat. Not everyone can do that.