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There will be delay in your delivery date due to high volume of delivery.

APT Estimate Index - The 2Hr Aquarist 1 review


With the 2HR Aquarist APT-EI, the famous nutrient dosing approach pioneered by Tom Barr is now available in a ready-to-use concentrate that removes the guesswork from trying to recreate this powerful and sometimes elusive formula.

An overview of the EI methodology can be found here.

Dose 5ml per 100L 3 times per week or 2ml per 100L daily.
FAQ here.


Customer Reviews
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Eric T.
Singapore Singapore

APT Estimate Index

My order was 1000ml but when got it only those 300ml with pump type...So when i notice wrong item so what text east ocean with my order invoice and picture item when i just receive...Was very surprise , without delay EO arrange 1 to 1 exchange by that night without any hesitates and was abit worries EO doesn't believe what i said when i receives it was 1000ml not 300ml but when what i said is truth it stay always truth. To solve it just check no of in stock will solove it fast cheers

East Ocean Aquatic APT Estimate Index - The 2Hr Aquarist Review

East Ocean Aquatic

Thank you Eric for being patience with us. We do apologies for the trouble cause. Eric has been very kind to our team and allow us to remedy the error.