The coin in a wishing fountain may actually help keep the water cleaner. Well, today we’re diving into a similar product. This copper disk keeps algae from taking over bird baths, no chemicals needed. That smart twist helped it stand out fast in the crowded backyard birding market, hitting 10,000+ sales a month and topping its category in just 93 days.
This copper disk is made from copper with laser engraving and sells for around $12, creating attractive profit margins. The raised dots on its surface increase water contact and double the release of copper ions. Although this seller wasn’t the first to offer copper disks, their results are outstanding. Launched in March, the product got its first sale after just 14 days and went on to sell over 11,000 units in four days this month, generating more than $146K in revenue. It offers two variations. Thanks to its compact design, the disk fits into a small envelope and keeps FBA shipping fees around $3.
Recent daily sales are 350+ units, and within 3 months they’ve earned 392 ratings with a 4.5-star average. Customers consistently highlight how the disk reduces algae growth, combining strong volume with great reviews.
Some reviews also shared useful feedback. Customers want the disk to stay effective for a longer period without needing replacement. Others are asking for larger size options to fit bigger bird baths. There’s also demand for a more durable design that resists discoloration and wear over time. These are clear signals for future development.
The product price fluctuates frequently between $9.99 and $13.99 as part of a high-frequency, small-step pricing strategy. This helps test price sensitivity and respond to new competitors entering the market. Most of the time, the list price is kept at $15.99, so the actual selling price feels like a deep discount. When the BSR slightly dropped in June, the seller activated a 21% coupon, which quickly boosted the ranking and helped it climb steadily again.
There were three FBA stockouts in March, April, and May. Each time, the BSR dropped sharply, but the ranking recovered very quickly once inventory was replenished. With limited competition and strong demand during the spring and summer peak season, the product bounced back fast.
On the ad side, highly searched keywords like bird bath and bird bath for outside have average PPC bids under $1. The seller focuses heavily on high-converting terms like copper bird bath, where ad share reaches 84% with an average PPC bid of $2.26. There’s clear investment in ads, with strong results from more specific search terms such as cleaner safer for birds and purification disk.
We found the original idea came from Erva, a garden metalware brand known for outdoor and bird-related metal products like bird baths and garden hardware. The copper disk was a natural extension of their product line. But the best-selling version today comes from Mellbree, which added its own touches in logo design and raised dot placement. Unlike Erva’s niche focus, Mellbree moves across categories, quickly spotting profitable niches, iterating fast, and it’s paid off brilliantly in this case.
The data shows that products in the copper disk cleaner niche have already built solid sales and review momentum. Both sales volume and rankings are still climbing fast, pointing to active market expansion. New sellers are either launching fresh designs, like cherry blossom shapes or bird-shaped copper, or offering multi-packs to meet demand from buyers who want more than one.
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