A refill replaces units that dropped after your order: if followers you bought disappear in a platform cleanup, the service delivers new ones to top you back up, free, within a guarantee window. It's this industry's warranty, and the small print is the whole product.
Refill covers DROPS: delivered followers that later vanish, usually because the platform removed accounts in a purge. You report or the system detects the drop, and the missing amount is re-delivered.
It does not cover everything that can change a count. If you rename the handle, set the account private, or the platform actions your account, refills don't apply, and a provider promising otherwise is promising something it can't do.
Windows vary by service: 30 days is a common honest shape, some run longer. On our listings, services marked with a refill guarantee state their window; unmarked services are priced as delivered-as-is.
The window's meaning is simple: inside it, drops are the provider's problem. Outside it, they're yours. Price the difference when comparing services, because a cheap service without refill can cost more than a marked one after one bad cleanup.
A refill replaces lost units with more of the SAME stock. If a service drops half its delivery every month, refilling re-runs the problem: that's a retention issue, and the fix is a better grade, not a warranty claim.
Treat the refill line as a quality disclosure: providers guarantee what they expect to survive. A strong guarantee usually sits on stock built to last; a missing one tells you what the provider expects.
For 30 days after delivery, followers that drop get replaced free. After 30 days, the guarantee ends. The window starts at delivery, not at purchase.
Depends on the service: some monitor and top up automatically, others refill when you report a drop. The listing or support tells you which.
Non-drop is a claim about the stock (it shouldn't fall). Refill is the warranty if it does. The honest combination is high-retention stock WITH a stated refill window behind it.
Related terms
Every definition lives in the full glossary, and the services behind the vocabulary are on the services page.