It comes with a pump. The water runs about 44 C (which is what the manufacturer says it will do) so the dropping water level is just a question of evaporation. We have added a fan for this round so the temperature should be lower in the next test following greenpinelane's experience.

Now that we have fixed the problem with the tank not too worried as will install a chiller (no hot tub to heat lol).

The pump flow with only one kit is not that strong. Like a aquarium pump mostly.

I wasn't around for harvest so no photos this time. We'll fix that on test 2.

Quote Originally Posted by thatsmefiend
Yeah actually I noticed it being in "series" on the manufacturers site... which pretty much ruins the whole "counterflow design" that everything else uses! It's probably better in parallel atleast thats how I'd hook it up despite their reccomendations. if your water level is decreasing or evaporating then the water must be too hot. You could always use city water and a drain to cool the lights but thats just wasting water... a chiller is the way too go

does it come with a water regulator?

can you post pics of your harvest? im very interested, been at this light a lil too long.... thanks