I just installed a waterboss mdel 550 and as part of the install used an inline airgap (Gap-a-flo). However, I'm finding that water is flooding out of the airgap during the main backwash cycle. It is fine during the slow brine rinse cycle. The recommended flow rate for the airgap is upto 7 GPM but they say it has been tested at upto 15GPM (or thereabouts). Virtua tennis 4 pc download. I am surprised that the softener could be putting out this much out of the drain.

The other possibility is that I used a short stub of 1/2' ID PVC to hook up a barb fitting to the drain line (supposedly 1/2' drain according to the manual although it actually measures more like 5/8'). I know that some flexible lines like for irrigation do not exactly measure upto what they say it is supposed to be - I think 1/2' is not 1/2' actually. I think PEX also has misleading dimensions as I recall. I am wondering if the reduction to the 'real' 1/2' ID from 5/8' is causing this. I will be calling both airgap and waterboss to check the peak flow rates but any insight into this would be useful.

You're seeing the difference between IPS and CTS tubing. IPS 1/2' is closer to 5/8' ID and will allow 1/2' CTS tubing to fit inside it because the ID is used to identify CTS and 1/2' is 5/8' OD. My guess is that your Gap-A-Flo is not installed straight or your softener doesn't have a DLFC which is hard to believe. Possibly it is the drain the GAF is attached to, that's probably the primary cause and the drain isn't capable of accepting the total flow of the entire backwash and it backs up to overflow. Gary xxxxxxxxxxxxxxxxxxxxxxxxxxxx Company Name Removed Only Doug Aleshire, Super Moderator 2. I double checked the GAF and it is installed correctly and pretty much vertical. I think that the drain being the problem is probably correct although I am thinking the problem is with the immidiate drain out of the GAF.

The 1/2' line is then expanded to a 2' and the drain from the softener is combined with the WM via a sanitary tee and then coupled to the WM standpipe. The WM works fine so as far as I'm aware the problem is unlikely to be in the standpipe/drain. I contacted Waterboss and was told that the up-flow cycles were high flow (did not give an exact number but I guess this is down to the water pressure and the drain diameter as well as the flow restriction of the softener). I am thinking of expanding the drain line out of the GAF from 3/4' to 1' before going to 2'.

Hopefully 1' will be large enough to support the flow. I presume DLFC stands for drain line flow control. No sadly there is no such control on the softener to control flow down the drain.

Minnesota Rules, Chapter 4714 Section 611.2 requires air gap discharge for water conditioning. Ivory yamaha studio c7 lite package. Including piping and fittings, must be listed in the MN Plumbing. CROSS CONNECTIONS AND WATER SOFTENERS. Water Softener Discharge Line.

Well I guess taping is an option after the inspector leaves I will try reaming the line with some wire to see if any debris after the install is plugging the line. If not expanding the line seems to be the available option. As for the standpipe flow capacity - I guess it is a possibility but the WM seems to discharge fine through it and it is a 2' drain with the opening about 5' above the trap (I'm guessing here since I've not opened up the wall but a cleanout is visible at the floor level.) As for the DLFC - since it does not appear to be an option on the controller would this be a physical control.