I currently have 2x Swiftech MC35X pumps with PWM control connected to my Maelstrom reservoir and find the PWM control to be a pain, I would prefer to be able to manually adjust the flow and leave it at one setting. The problem I find with PWM is that the CPU header is generally the only one that actually uses PWM control and it often assumes that 100% is where your fan/pump is at maximum, unfortunately my pumps have their max at only 50% and the PWM control doesn't go down to zero so I can't make my pumps completely silent because of that. I find that the temperature difference between 1800RPM and 4500RPM with my pumps to be small enough to not bother increasing the pumps speed during operation (2-5°C). I don't know if XSPC do a PWM version but I would choose the vario version myself.
The main reason I use pure water rather than additives is because your blocks and radiators will last longer and likely perform better in the long run without the additive build up. To prevent algal and micro-organism growth just add a silver kill coil to your reservoir rather than putting in any additives to kill the organisms. So far mine has worked really well, the Primochill Advanced LRT tubing leaches a lot less than what I have experienced before and the water remained clear in my system for the last year. I've recently purchased some Reverse Osmosis (RO) water from a local fish shop which de-mineralises the water to reduce electrical conductivity and removes the smallest of impurities; it is the same process that is used for the water you buy in the watercooling shops, just not passed through as many times; I got 25 litres for £9 and can refill it for £4 which is much less expensive than any water in the cooling shops, I use it to clean my loop so that there isn't any mineral build up from rinsing with the hard tap water in my town.


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