Live Amazon price · product details checked 5 September 2026
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envii Algae Klear Xtra, Blanket Weed Treatment for is one of 50 fish & aquatic products on our shelf, compared on what buyers rated it, how many of them there were, and what it costs today. Here is how the maker describes it: Algae Klear Xtra safely removes submerged blanket weed and string algae in all ponds. Our algae treatment can be used all year round making it suitable for treatments through winter. Specifically designed to target and kill all submerged algae effectively within 3 weeks of the first treatment. That is the maker talking, not us, so read it as a claim rather than a finding. Buyers have it at 4.1 out of 5 from 4,145 ratings. We work out below what that is worth against everything else on the shelf.
Shelf price range checked · details
The typical fish & aquatic product on our shelf scores 4.6 out of 5, measured across 50 rated products. This one comes in at 4.1. That lands in the bottom quarter. Nothing alarming on its own, though at this money you can find better-rated neighbours, so there should be a particular reason for choosing it.
That score rests on 4,145 ratings. The median for this shelf is 3,120. That's enough for the score to mean something without being the last word on it.
On money, this sits in the top third of a shelf running from £2.11 to £29.98, with the midpoint around £9.76. Paying above the middle of the shelf needs a reason the star rating does not supply, because on ratings alone the extra money is not buying an advantage here.
Shelf prices checked · details
Worked out from the 50 fish & aquatic products we track, not from the brand's own claims. How we rank →
Taken from the product listing via Amazon's product API. These are the seller's claims, not our test results.
Short on time? Our best fish & aquatic shortlist narrows this shelf down to a handful.
