Ruling on Female Discharge during Fasting
Question

Please tell me if a transparent fluid like water is excreted which becomes white coloured after drying is our fast and prayer valid. Is ghusl fard on us or not? Please tell me because I pass this thing a lot and find it on my underwear and I do ghusl 2 or 3 times a day to make my fast and prayer valid. Please tell me what this is and what I should do.
Praise be to Allah.This kind of discharge is passed a great deal by women. It is pure and not impure, and there is no need to do ghusl because of it. All it does is invalidate wudu . 
Shaykh Ibn ‘Uthaymin (may Allah have mercy on him) was asked about it and he replied: 
“After researching the matter, it seems to me that the discharge that is passed by women, if it does not come from the bladder but rather from the womb, then it is pure. 
This is the ruling on this discharge with regard to purity. It is pure and does not make the clothes or the body impure. 
With regard to wudu, the ruling is that it invalidates wudu , unless it is continual , in which case it does not invalidate wudu, but the woman should not do wudu for each prayer until after the time for the prayer has begun, and she has to use a pad. 
But if it starts and stops, and it usually stops at the time of prayer, then she should delay the prayer until the time when it stops, so long as there is no fear that the time for prayer will end. If she fears that she will miss the prayer, then she should do wudu, use a pad and pray. It makes no difference if there is a little or a lot, because it is all coming from the front passage so a little or a lot invalidates wudu.”  ( Majmu’ Fatawa Ibn ‘Uthaymin, 11/284)
Using a pad means placing a piece of rag or cotton etc., in the vagina so that less of this discharge will come out, and to prevent it getting on to the clothes or body. 
Based on this, there is no need to do ghusl because of this discharge, and it does not affect the fast. With regard to prayer, wudu must be done for each prayer after the time for the prayer has begun, if the flow is continual. 
And Allah knows best.