JBL ProAquaTest SiO2 Silicate & Refill

My tap water was reading off the charts for silicates, and after a week of using this test my diatoms finally made sense. The color chart is clear enough to read even in dim aquarium lighting, and the refill pack makes it easy to keep testing regularly.

I was skeptical about testing for silicates, but this kit made it really easy with the clear color chart and simple drops. The refill keeps it affordable for regular checks, and now my diatoms are under control.

Finally got rid of the brown gunk on my glass and plants — the test read a clear 0.5 mg/L after adding the refill, so I know exactly when to dose. The color chart is easy to match even in low light, and one refill lasts me months of weekly checks.