People buy water treatment equipment online and then look for someone to fit it. It is a reasonable thing to do and we are usually happy to help.
There are three things worth settling first, and only one of them is about money.
1. Was it chosen against your actual water?
This is where customer-supplied equipment usually goes wrong, and it is almost never a quality problem. It is a matching problem.
A softener needs to be sized to your hardness and your household's water use. Bought without a hardness number, it is a guess — and undersizing means it runs out between regenerations while oversizing wastes salt on every cycle.
A UV unit needs water that meets the NSF/ANSI 55 conditions, and the one that trips up wells here is iron under 0.3 mg/L. Since 70 to 76% of local groundwater sites exceed that, a UV system bought without an iron number is a coin toss.
A carbon filter needs to match the disinfectant. Standard activated carbon handles free chlorine easily and chloramine poorly; catalytic carbon is a different media for a different job.
None of that is visible on a product page, because the product page does not know what is coming out of your tap.
So the first thing we do is read the water. If the unit fits, we fit it. If it does not, you would rather find out before it is plumbed in.
2. Who holds the warranty
The manufacturer warranty stays with you. You bought it, you registered it, and a claim is yours to pursue. We are not in that chain and cannot be.
Our warranty covers our work — the installation, the fittings, the workmanship.
That split is clean and normal, but it means a failed unit is a conversation with the manufacturer rather than with us. Some manufacturers also require professional installation for the warranty to hold — worth checking before you buy, because it can turn a self-install saving into a self-install cost.
3. What the install actually involves
The box price is not the installed price, whoever supplies the box.
Depending on the unit and the house: bypass valves, fittings and adapters, a drain line with an air gap, a power outlet, sometimes a plumbing modification to get the equipment where it needs to be in the sequence. On a softener there is also the question of which taps end up downstream, which is easier to get right at install than to change later.
What we will not do
Install something we can see is wrong for the water without saying so. If a test shows the unit will not do what you bought it for, we will tell you, and you can decide.
That is not a sales tactic to displace your purchase — most of the time the answer is that it is fine and we get on with it.
The free in-home test is the sensible first step whether the equipment is ours or yours, and it is free either way.