E-commerce · Water Purification
The buyer knows the machine and not the part number, and searches for neither.
This cartridge buyer has a machine at home and a worry that it is not working properly. The water tastes off, the flow has dropped, or a technician said it needs a service. They often cannot read the model number on the unit, and cannot tell a sediment filter from a membrane.
A 90-minute audit call and a written, scored report. Turnaround, reporting and term are agreed in writing after the audit.
In one paragraph
Replacement cartridges are the sediment, carbon, RO membrane, UF and UV parts that keep a water purifier working, sold by brand and model to owners who are due a change. GullySales works on how your listings tell an owner which cartridge fits their exact purifier, how genuine parts are told apart from look-alikes, and how owners are reminded before the filter runs out.
So a cartridge page has one job: to get the owner from "my purifier" to the exact part, in as few steps as possible. Everything else, from price to packing, follows from that.
Last updated 7 Oct 2026. Product, labelling and advertising rules for water purification differ by product and change. We describe them in general terms, so check the current position with your own adviser or the regulator before you publish a claim.
Who it is for
This is written for you if you sell replacement cartridges online.
- Purifier brands that want cartridge and service orders to come to them directly
- Dealers and service firms that supply parts for several makes
- Sellers of membranes, UV lamps, pre-filters and sediment elements on marketplaces
- Sellers of annual cartridge sets and service kits for homes and offices
Not for
It is not the right fit if.
- A seller who lists parts as fitting a model without checking that they do
- A seller who passes off look-alike parts as the maker's own
How buyers choose
What decides the sale of replacement cartridges.
The exact machine
Brand, model name, sometimes the year. A wrong cartridge is a return and a wasted fitting visit, so owners look for model lists and check them against the sticker on the unit.
Genuine or compatible
Buyers read for whether the part is the maker's own or a made-for-fit alternative, and distrust a price that is far lower than the one they paid before.
Which cartridge is due
A set, or just the sediment and carbon, or the membrane. An owner who changed the membrane last year does not want it again, and asks what the machine's indicator means.
Who fits it
Many owners can do a sediment change, and few want to touch a membrane. They ask if a technician can come with the part or if a video will do.
Where sales are lost
What usually goes wrong when you sell replacement cartridges online.
In the words sellers use on the first call.
“Buyers order the wrong cartridge and return it”
They searched by brand and bought the one at the top of the page. A model finder in front of the product list stops it.
“Marketplace look-alikes sit above our genuine part”
A cheaper cartridge that looks the same takes the click, and the buyer finds out later. Showing how to tell the genuine part is worth a page.
“Owners forget until the water tastes bad”
With no reminder, a buyer waits for a symptom, often phones a local technician and buys whatever the technician brings. The reorder is lost.
The scope
The work we would propose for replacement cartridges.
Measured on purchases, conversion rate, cost to win a customer, average order value and repeat purchases. Anything here that needs a platform or tool we have not used with you is confirmed in the audit before it goes in the scope.
- A cartridge finder by brand and modelBrand, then model, then the cartridges for it, with the part named in the owner's words and a photograph of the sticker to show where the model is.
- Compatibility tablesA table on each listing of the models the part fits, which you confirm before it goes live, and an honest line on what it does not fit.
- Reminders before the filter is dueMessages to owners, with their consent, before each part is due, with one link to the right cartridge set.
- Set and kit bundlesCartridge sets for a year of use, with or without a fitting visit, offered where the owner is already choosing a single part.
A genuine-part page
A short guide on how to tell your part from a look-alike, with the pack, the seal and the code to look for, if you sell genuine parts.
What we do
What you get for replacement cartridges.
Each deliverable and what it is there to change.
A brand and model finder
A short path from the owner's machine to the right parts, tested with real model names before it goes live.
A compatibility sheet for your range
A checked table of parts against models that the team uses to answer questions and that the website reads from.
A fitting guide for each part
Pictures and a short video for the changes an owner can do, and a booking link for those they should not.
A reminder sequence by part
A message set that prompts for the sediment filter, the carbon and the membrane separately, since they do not fall due together.
How the result is measured
- Purchases
- Conversion rate
- Repeat purchase rate
- Return rate for wrong parts
- Customer acquisition cost
- Reminder responses that become orders
Recorded as a baseline before work starts, so every later report has an honest comparison.
How it works
From your first message to the first report.
No open-ended retainer. Every step gives you something in writing.
First
Free audit call
90 minutes with whoever handles your enquiries: how they arrive, how fast they are answered, where they are lost.
After the call
Written, scored report
Six areas scored, fixes ranked by return and cost. If you want our help, the scope, the fee and the reporting come with it, in writing.
Before work starts
Baseline recorded
Enquiries by source, reply time, conversion and cost per order, written down so every later report has an honest comparison.
After the baseline
The first fix goes live
Usually the cheapest one on the report: reply time, a follow-up sequence or the marketing-to-sales handover.
As agreed
Report against the baseline
What moved, what did not, and what changes next, in plain words. How often you get it is set in writing before work starts.
At renewal
Renew on the numbers
The term ends and you decide whether to continue from the results. The length is agreed in writing before anything starts.
What we need from you
What to have ready before the audit call.
None of it has to be tidy. We read what you have.
- The brands and models you supply parts for
- Your part numbers and the models each fits
- Return reasons, especially wrong-part returns
- Sales of cartridges by month and by part
- Your fitting arrangement for owners who do not want to change it themselves
Selling in India and abroad
Selling replacement cartridges beyond your own market.
Where you sell decides sizes, units, seasons and returns. We work from Bengaluru and have no overseas office, so for a new country we start from your own sales and the platforms you already use.
Indian machines in homes abroad
Indian households overseas who brought a purifier with them need parts for it. They search by brand and model, and a finder that works by model is the sale.
Shipping and what may be sent
Membranes and filter parts are small, but customs rules for filter media and lamps differ by country. Check with your adviser before shipping, and start with the countries already asking.
FAQ
Questions about selling replacement cartridges online.
Not here? More answers, or ask on WhatsApp.
How do I stop buyers ordering the wrong cartridge?
Can I sell cartridges for purifiers made by another brand?
How do I get buyers to change cartridges on time?
Should the listing say how long a cartridge lasts?
How much does it cost?
How long is the contract?
Who will actually do the work?
What do you need from us?
More in Water Purification
Sellers of replacement cartridges also need
Also selling from a shop, a workshop or a warehouse? See the page for water treatment solutions providers.
This page is part of the e-commerce section. The D2C brands page covers the arithmetic of acquisition cost and the second order for any brand.
Why us
Why owners pick GullySales over an agency.
Marketing and sales, as one job
Most agencies stop at the enquiry. We also fix what happens after it: the reply, the follow-up, the quote and the CRM.
The person on the first call does the work
No account managers in between. You are never handed to someone you have not met.
A baseline before anything starts
Your numbers are written down on day one, so every later report compares against something honest.
The fee in writing, split three ways
Our time, your media spend and production on separate lines. You always see what goes to us.
No guarantees we cannot keep
The term is agreed in writing and never a default twelve months. We never promise a ranking or a lead count, because nobody controls those.
One office, and we say so
Nagarbhavi, Bengaluru. We work across India by call and WhatsApp and travel when a session needs to be in person.
#257, 3rd floor, Sri Nanjundeshwara Complex, Nagarbhavi 8th Block, Outer Ring Road. How we work.
Engagement options
Ways to work with us.
Pick the size of commitment that fits. Every option starts with the free audit.
Option 1
The audit on its own
A 90-minute call and a written, scored report. It says honestly whether you need outside help, and many fixes are ones your own team can make.
Option 2
One fix, scoped
Start with the fix the audit ranks first, such as reply time or follow-up. The fee is in writing before anything starts.
Option 3
An ongoing programme
We run the work, report against the baseline, and you renew on the numbers. The term and the reporting are agreed in writing first.
Option 4
Guidance for your own team or agency
We plan, brief and check the work of your in-house team or current agency, instead of replacing them.
The offer
Start with a free audit of how your replacement cartridges sell.
It is useful on its own, whether or not you hire us.
What you receive
- A 90-minute call with the person who will do the work
- A written, scored report on the six places orders leak
- Every fix ranked by what it returns and what it costs
- The one thing to do first, and why
- An honest line on whether you need outside help at all
- If you do, the scope and the fee in writing
No invoice. No obligation. No sales script.
Your next practical step
Get a free audit of how you sell, and a scored report of where the work is.
90 minutes. A written, scored report. No invoice and no obligation.