Nu-Calgon4291-08 Nu-Brite, 1- Gallon

This works just like it says have enough for two more years

This is the best coil cleaner I have ever used in 35 years of servicing A\C condensers. Recommend to all of my friends.

I'm a DIY - HVAC contractor wanted $400 per unit to clean outside condensing coils. I have 3 units, took me about and hour to disassemble and clean each unit over a couple of days. 3 - 4 hours outside, saved $1,154 bucks. Cut it with some water and use hand sprayer. Be sure to cut power, lock out, protect circuit board and compressor from water (garbage bag cover) let sit for 5 - 10 minutes, will foam up, don't breath fumes, gently rinse with water from inside out.

I just used this today to clean my lennox heat pump condenser coils. The directions say to mix 1-to-4 for heavy grime, and 1-to-8 for light. I added 200 ml to a hand-held garden sprayer with the pump on the top, and topped off to 1200ml with water. It was the perfect amount to spray both in inner and outer coils. I removed the fan (but first pull the power disconnect). I could reach inside with the small sprayer set to fine mist instead of heavy stream. I covered all radiator fins on the inside and outside, while wearing protective glasses. I got a wiff of the spray which reminds me of a strong caustic agent (this is NOT window cleaner despite the pretty blue color!) I then took about 10 minutes to pull out the garden hose and spray handle set to 'garden' setting for medium spray. I read warnings NOT to use the 'jet' setting which could risk bending old fins. After ten minutes or so, there was foam coming out the in/out sides of the condenser. I sprayed down from the top to wash the dirt away from the coils. i finished the inside with a web-dry vacuum. Any bent or dinged fins got straitened with a heavy brush (see videos online). I figure at this ratio I can get professional-grade cleaning about another 10 or 12 times from this single gallon. I think it's a great deal.

Foamed up dirt comes out right away good product

Great product, pretty potent stuff. I manned-up and used it with shorts and without gloves. Every now and then a drop would fly on my skin and quickly started to burn. No marks or long lasting affects.I did the heavy use 1:4 ratio and mixed 3.2 cups of this with 12.8 cups of water into my 1 gallon sprayer. I went nuts and used the whole gallon for one application. After I sprayed it into the crevices it started to foam up. I sprayed the inside too for the heck of it. After a few minutes the foam started to look brown as it carried the dirt out of the cracks. About 15 minutes later I rinsed it all off with water.After putting everything back together and turning on my A/C, man I tell ya that thing is many times quieter than it was before. I've had to open the door to check that it's even on. It was getting louder and louder as each month passed. You kind of get used to it since it's a slow progression of noise. The motor can work less and cool more efficiently. I'm sure it'll show in my electricity bill.What led me to getting this product is that the compressor kept itself off after overheating while the fan was still turning. I came home and the furnace was still circulating inside air but it was warm at 82 deg. I ordered the product then luckily the day it came the compressor/fan was so loud we had to turn it all off so the neighbors wouldn't complain.Last season I used a $5 can of cleaner from the local hardware store. Did it's job for one season. But from now on I'm using this product every Spring.

Will make your HVAC coils look new just be careful it is very strong and wear gloves and glasses etc. definitely mix it based on how dirty your coils are 1 gallon can last a long time. Great brand with a good reputation.

Very like make clean so easy