Review on Enhance Water Quality with iSpring FD15 DeIonization Filter for Aquariums by Andy Baudoin

Previously works great at 0ppm. Connected to the output of the reverse osmosis system. It's been like this for a few weeks and I don't see much of a change in color. But I haven't tried replacing the resin yet. There were no fittings in the kit, which is annoying, but luckily I had fittings from another DI filter that didn't work. The standard reverse osmosis system works with 1/4 inch pipe fittings. You want the fittings to fit the cartridge with threads on one side. You can insert bare 1/4" tubing, even one you cut off, and tighten. Then screw it into this cartridge. Update: After one year it was producing 22ppm (30ppm by reverse osmosis). The next Times I will replace maybe in 6 months It was easy to open and fill It took a while to open but didn't need any tools Based on all the 1 star reviews of it breaking I didn't tighten it heavily when resealing .Just snug.I don't think that little force could ever break anything.Even then it won't drip.You may need a tool to open it,but when closing it please just hold it firmly with your hand and don't strain it.Or you could be the next 1 star reviewer who broke your filter.