Water Treatment and Softener Service Invoicing App (2026)
Water treatment is an install business sitting on top of a recurring service business — filter changes, salt delivery, and annual sanitizing. ShowTheReceipts ($15/mo) quotes systems from a water test with equipment and install as separate lines, then bills the recurring filter and salt schedule automatically so the maintenance revenue doesn't quietly lapse.
How we picked
Entry-plan prices as published in 2026, taken from each vendor's own pricing page or a recent third-party summary. Judged on the solo technician's real workflow — test-driven system quoting, install and equipment split, and recurring filter/salt billing — not on water lab result management, dealer ordering portals, or multi-truck dispatch.
| Software | Starting price | Best for |
|---|---|---|
| ShowTheReceipts That's us | $15/mo | Solo techs: system quoting, recurring filter and salt billing, service call rates, tax-ready books |
| Invoice2go | $9.99/mo+ | Basic mobile invoicing |
| Joist | Free / $8/mo | Cheapest estimate-and-invoice pair |
| Kickserv Flex | $19/mo | Budget scheduling with invoicing |
| Jobber | $29/mo (Core) | Companies running several service trucks |
An install business with a service business inside it
The system sale is the visible half. Filter changes, salt, and annual sanitizing are the half that compounds — small numbers, every customer, twice a year, forever.
If you don’t automate that billing, you’ll lose most of it to just forgetting.
1. ShowTheReceipts — $15/mo
Test-driven system quotes with equipment and install split, recurring filter and salt schedules billed automatically, service call rates saved.
2. Invoice2go — $9.99/mo+
Basic mobile invoicing with no recurring schedules.
3. Joist — Free / $8/mo
Cheap estimate-and-invoice pair.
4. Kickserv Flex — $19/mo
Budget scheduling with invoicing attached.
5. Jobber — $29/mo (Core)
Dispatch for a company with several trucks.
The lines a system quote needs
- Water test — the basis of everything, charged or credited
- Equipment — softener, filter, RO, UV, by model and capacity
- Installation — plumbing, bypass, drain, electrical
- Pre-treatment — sediment or iron filtration where the test calls for it
- Startup and sanitizing
- Recurring plan — filters, salt, annual service
Lead with the test result
A number on a page beats an opinion about hardness. The test is what sizes the system, justifies the price, and separates you from a retail box nobody measured anything for.
Charge for it, credit it against the install, and put the result on the quote.
The salt route is quietly excellent
A per-delivery fee is small on its own. But multiply it by every system you’ve ever installed, twice a year, and it’s a real business — and every delivery is a service inspection you’re already being paid to perform.
Frequently asked questions
How should a whole-house system be quoted?
From a water test, with equipment and installation as separate lines. The test result is what justifies the system size and type — quoting a softener without one is guessing, and it's also the reason a customer can't meaningfully compare your quote to an online box price.
How do I keep the service revenue from lapsing?
Put the filter change and salt delivery on a recurring schedule and bill it automatically at install. Water treatment maintenance is forgotten by customers almost universally — and a system with an unchanged filter is a warranty complaint waiting to happen.
Should I sell salt delivery?
Yes, on a route. It's a modest per-visit number that compounds across a customer base, it puts you in front of every system you installed twice a year, and it's how you spot problems before they become emergency calls.
How do I compete with big-box softeners?
On the water test, the sizing, and the service. A retail softener sized by nobody, installed by a general plumber, and never serviced is a different product — and saying that with the test result in hand is a factual argument, not a sales pitch.