The arguments worth having before you spend
Why not just rebuild the valve and get a few more years?
That is genuinely the right call on a younger unit. The question is what the resin underneath the valve has left in it. A new valve does not restore exchange capacity.
Published repair figures run to about $2,545 for a full rebuild. An installed system averages near $1,500 nationally. At that ratio, a rebuild on an old bed is poor value.
The unit still makes soft water some of the time
Intermittent softening is what a bed near the end of its life looks like. Capacity falls, the unit exhausts before the next cycle, and hardness returns between regenerations.
Turning up the salt dose masks it for a while. The cost is more salt and more water down the drain. That is a workaround, not a fix.
I do not want to pay for a permit on a straight swap
We understand the frustration, and it is not our rule. A water conditioning system in unincorporated Clark County requires a permit and an inspection, regardless of who installs it.
The county issues this permit online with no plan review, so it is paperwork rather than a delay. Skipping it puts an unpermitted alteration on a house you will eventually sell.
Should I switch to a salt free system this time?
You can, as long as you know what you are buying. A salt free conditioner does not remove calcium and magnesium. The hardness reading afterward is the same as before, because nothing was taken out of the water.
If your reason for replacing is that you are tired of hauling salt, that is a fair reason to consider one. If your reason is scale on fixtures, understand the result will be different.
Can I just buy a bigger one to be safe?
Oversizing is safer than undersizing here, but it is not free. A very large unit on modest water use regenerates rarely, and the bed can sit unused for long stretches.
Sizing to your actual household at 16 grains per gallon is the aim. Your own water bill supplies the usage number, so the arithmetic can be done without guessing.
How do I know the new one will not fail as fast?
Two things shorten resin life here, and the valley delivers both. Hardness is one. Free chlorine, published at an average residual of 0.99 parts per million, is the other.
Carbon filtration ahead of the softener removes the chlorine before it reaches the resin. Correct sizing handles the other half, because an undersized unit regenerates itself to death.