habían testado
-they/you had tested
Past perfectellos/ellas/ustedesconjugation oftestar.

testar

Antes de la compra de la bomba slurry sumergible Goodwin, el cliente tenía que drenar el tanque y excavar la ceniza manualmente, ya que todas las bombas que habían testado previamente solo retiraban el agua de superficie y no convertían la ceniza en slurry ni la bombeaban.
Prior to the purchase of a Goodwin submersible slurry pump they had to drain the tank and manually excavate the ash because every other pump they tried just took off the surface water and did not turn the ash into slurry and pump it.
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