The symptom is specific: filters create a huge number of low-value URLs. Start with the affected item and identify the decision or input that could produce this behavior.
Find the likely cause
Every combination exposes another crawlable path.
Treat this as an explanation to verify against the actual work. Look at the input, the relevant decision, and the final result together. If the evidence does not support this diagnosis, investigate the mismatch before applying a convenient but unrelated fix.
Make the targeted correction
Inventory patterns and agree on a deliberate technical handling strategy.
Filter navigation should support useful shopping choices while keeping URL behavior understandable and maintainable.
Check that the repair worked
Check representative combinations and monitor resulting URL discovery.
Repeat the check on the final version that the reader or customer will encounter. An approved draft, a preview, and a published result can differ; the acceptance decision should concern the version people actually use.
Prevent the next related failure
A separate issue to watch for is this: filtered pages have no matching products. Disable impossible choices or provide helpful alternatives in the interface.
Monitor the useful outcome
Monitor discoverable URL patterns, useful landing pages, and technical errors after navigation changes.
Keep a short record of the original symptom, the evidence behind the diagnosis, and the result of the acceptance check. That record makes the solution reusable when the same condition appears again, without assuming that every superficially similar problem has the same cause.
Official reference for the platform or standard discussed: Google: faceted navigation.