Purchased the wybot A1 last August and was quite impressed with the results. However, the sponge filter started to degrade earlier this summer. Wybot does not sell replacement filters and the ones on Amazon are a complete scam and waste of money. They do not fit the machine. Here is Wybot’s final answer to me “ The foam filter is a consumable part. You can buy large pieces of foam by yourself, cut them to the proper size, and install them into the A1 unit.”
Tried that. Only foam I could find that meets the 50 ppi specs is to thick and when installed compresses and degrades the performance. Will be replacing this machine with a brand that actually supports its products.