Hydrotops
UK-made for decades and barely reformulated, which is the point - a room dialled in on Hydrotops keeps buying the same thing.
Nothing matches all of those filters.
The Hydrotops range
Hydrotops — British bioponic feeds for UK water
Hydrotops is a smaller, more specialist range than most brands on this site, built specifically around UK tap water rather than adapted from a European or American formula. The bioponic approach blends mineral and organic elements in one system, and the range has built a genuinely loyal following among growers who've tried the bigger Dutch and American brands and settled on Hydrotops instead — it's more of a discovery brand than a default first buy.
Triple F and Top Heavy Crop are the names growers ask for by name rather than by category, covering general feeding and a late-flower weight push respectively. Because the formula is built around UK water hardness specifically, growers switching from a Dutch or American range sometimes find they need less cal-mag correction than they were used to running alongside those brands.
If you're currently on Canna, Dutch Pro or another Dutch import and finding your water needs constant cal-mag correction, Hydrotops is worth trying as an alternative rather than adding another bottle to fix the mismatch. See base feeds for the wider range, or call the shop for a direct comparison to what you're running now. Free delivery over £60.