Plain and simple, they don't work at all. Compared to testing each item with a chemistry test kit, the numbers were very different. I got a pH of 6.4 while my chemistry test showed a pH of 7.8. The ammonia was at 0 ppm while the chemical was back at 0.50. I've learned my lesson. don't be cheap I'm just thankful that I only lost 1 fish before realizing it.
Steam cleaner Deerma Deerma DEM-ZQ610 EU, white/red
68 Review
Vacuum cleaner TEQQO Aquastick 3 in 1 Power, grey/turquoise
26 Review
Efficient 2-In-1 Magnetic Fish Tank Cleaner With Non-Slip Design And Scratch-Free Blades
37 Review
𧲠Efficient Magnetic Fish Tank Cleaner: KEDSUM Floating Clean Brush with Handle Design
34 Review