Not exactly chlorine free!
I have found with the Enviroswim system that after leaving on the pool blanket for a while there is a noticeable chlorine odour, Spoke to my local pool bloke who has dealt with these in the past and that they do produce some chlorine,was not what I had hoped for, rather disappointed :(
Sorry that you are disappointed that your Enviroswim is making chlorine with your pool blanket on. This could be expected as your pool water contains low amounts of sodium chloride and if the system is running with the pool blanket on and no bather load for long periods the levels will soon build up.
Any device that uses electrolysis in water that contains even a low level of salt will produce some chlorine. We have never hidden this fact as this is basic chemistry. It has always been highlighted on our websites FAQ page. www.enviroswim.com/faq The bottom line is that we do not require the high chlorine levels, the production can be reduced by shortening the daily run time. The best advice would be to reduce the run time of your Enviroswim and pool pump, this will also save on your power costs. Also, we recommending checking how much salt is in the pool and the TDS of the actual pool water. If the salt level is too high the system will perform like a salt chlorinator and produce more chlorine.
The biggest feedback we receive from our customers is the freshness of the water and the lack of chlorine smell and associated allergies. Not forgetting that in government laboratory trials Enviroswim's kill rate on their designated test bacteria in 30 seconds took chlorine 15 minutes to match. If you measure a chlorine residual level much above 0.4ppm in an Enviroswim pool it could have too much salt or be running longer than necessary.
Our recommendations are to check the water balance as per Enviroswims operating instructions and correct if need be and reduce the run times of your filtration system and Enviroswim to maintain levels as per Enviroswims manual.
This should be fairly easy to do and the end result will be far nicer swimming pool water and a huge reduction in your operating cost.
Please visit www.enviroswimpoolschool.com for detailed help or if need be please contact us via www.enviroswim.com