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use a simple 4" computer fan pulling air out of the room?

Water chillers wont do that. But you will have to have some sort of exhaust system for the hot air to escape through.

Reef Playground does have the best prices on Aqua Euro USA Chillers and pumps. :D We try to keep them as low as possible All you would need to hook it up would be a small pump that runs anywhere from 40-160gph Slower waterflow will make the unit work more efficiently. Also, jsut a note guys...

that is a bit off. a 1:10 ratio is a bit high. some older membranes run at those, but most new models operate somewhere in the 1:3 to 1:5 range. But what i suspect you have is inadequate water pressure going into the unit. Its causing your unit to waste more water. Do you have a pressure gauge...

what pre-filters (kind and ppm rating)are you running on the ro and how old are they? are u also running a water softener or have a water softener on your house water?

yeh, that sounds like bs. ro/di water will have 0 ppm and a neutral ph level. 7.0 point on.

hot water does have high levels of tds. Mainly because its heated in a large metal drum called a water heater. The lining deteriorates over time, and causes higher tds elvels. In additional, a standard 75gpd/100gpd ro membrane maxes out at around 110F / 115F. Industrial membranes max out around...

sounds like its running fine now. and no, you want it to be hooked up to the cold line,. hot water will have a lot more tds in it. sounds like it flushed out and you're in business now

or an ro unit, preferably a 5 stage DI. OR could use things like dried peat moss to lower the ph.

they do effect the ph. as they remove the minerals that raise the ph levels. if the tds reading is under 10, the ph levels should be at 7.0 have you tested the TDS readings in the filtered water? what kind of test kit / meter are you using to test the ph? and how old is it? did you install...

yeh, the cl-85 wont work for your application. since its an electrical based chiller unit, its not as effective, especially for hydroponic applications. the next size is the 1/13th hp unit. We've sold several for hydroponic applications, so far, no complaints.

which model are you looking at? the AE-USA CL-85 or the AE-USA 1/13th HP? The CL-85 will not work well for hydroponic systems. Its really designed to keep a reef tank bellow 80F. If you're looking to get int the mid to low 70's. The 1/13th HP is what you want to get. It will cool a 30g system...

btw, what is the ambient room temp? and what kind of lights are you running? and is there any ventilation near the lights? (ie: fans blowing air in and pulling it out)

Well, I'm familiar with root rot on aquatic plants. If you have a 40g system, with a temp above 90F and need to lower it by 10-20 degrees you would need a 1/10th hp chiller, Aqua Euro USA 1/10th HP unit runs $329.99. You might get away with the 1/13th HP model, which is rated to cool a 30g...

i would go with lumatek

what temp do you need the water to stay at?

That particular unit will not work too well on hydroponic systems. It's electrical based, and is really designed to keep a system of no larger than 12g in the 77-79 temp range. For keeping the temp bellow that on 10-15g systems, you would need to get a refrigerant based chiller, the smallest...