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The filter in your Keystone KSTAD70B is meant to be washed. It is not listed as a replacement part in the owners manual. This is copied from the manual:
3. Clean the air filter
Remove the filter every two weeks based on normal
Remove the filter from the top of the unit (See.Fig.11a),
or to remove the filter,remove Bucket then pull filter
Wash the filter with clean water then dry.
Re-install the filter,replace Bucket.
DO NOT operate the dehumidifier without a filter
because dirt and lint will clog it and reduce
If you have lost or destroyed the filter, go to Amazon and order the Duck Brand 1285234 Replacement Air Conditioner Foam Filter, 24-Inch by 15-Inch by 1/4-Inch, 1-Pack for 96 cents with free shipping as an add-on item to any order. It is also washable so you will be able to use it like the OEM filter material.
Unfortunately, Delonghi, for whatever reason, does not post the Owner's Manuals for their Dehumidifiers online. However, if you call Delonghi Customer Support 800-322-3848 they can furnish one to you. Probably by email attachment.